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• How to read reduce/shift conflicts in LR(1) DFA?

  - by greenoldman

  I am reading an explanation (awesome "Parsing Techniques" by D.Grune and C.J.H.Jacobs; p.293 in the 2nd edition) and I moved forward from my last question: How to get lookahead symbol when constructing LR(1) NFA for parser? Now I have such "problem" (maybe not a problem, but rather need of confirmation from some more knowledgeable people). The authors present state in LR(0) which has reduce/shift conflict. Then they build DFA for LR(1) for the same grammar. And now they say it does not have a conflict (lookaheads at the end): S -> E . eof E -> E . - T eof E -> E . - T - and there is an edge from this state labeled - but no labeled eof. Authors says, that on eof there will be reduce, on - there will be shift. However eof is for shift as well (as lookahead). So my personal understanding of LR(1) DFA is this -- you can drop lookaheads for shifts, because they serve no purpose now -- shifts rely on input, not on lookaheads -- and after that, remove duplicates. S -> E . eof E -> E . - T So the lookahead for reduce serves as input really, because at this stage (all required input is read) it is really incoming symbol right now. For shifts, the input symbols are on the edges. So my question is this -- am I actually right about dropping lookaheads for shifts (after fully constructing DFA)?

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• Ubuntu 12.04 + Eclipse 64 bits key binding error

  - by user110933

  The text is quite extense so, this is just a part of it: !SESSION 2012-11-23 10:15:52.442 ----------------------------------------------- eclipse.buildId=I20120608-1200 java.version=1.7.0_09 java.vendor=Oracle Corporation BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US Command-line arguments: -os linux -ws gtk -arch x86_64 !ENTRY org.eclipse.jface 2 0 2012-11-23 10:16:06.408 !MESSAGE Keybinding conflicts occurred. They may interfere with normal accelerator operation. !SUBENTRY 1 org.eclipse.jface 2 0 2012-11-23 10:16:06.408 !MESSAGE A conflict occurred for ALT+SHIFT+R: Binding(ALT+SHIFT+R, ParameterizedCommand(Command(oracle.eclipse.tools.common.services.ui.refactor.rename.command,Rename, Rename the selected text., Category(org.eclipse.jdt.ui.category.refactoring,Refactor - Java,Java Refactoring Actions,true), oracle.eclipse.tools.common.services.ui.refactor.internal.ArtifactRefactoringCommandHandler, ,,true),null), org.eclipse.ui.defaultAcceleratorConfiguration, org.eclipse.ui.contexts.window,,,system) Binding(ALT+SHIFT+R, ParameterizedCommand(Command(org.eclipse.jdt.ui.edit.text.java.rename.element,Rename - Refactoring , Rename the selected element, Category(org.eclipse.jdt.ui.category.refactoring,Refactor - Java,Java Refactoring Actions,true), , ,,true),null), org.eclipse.ui.defaultAcceleratorConfiguration, org.eclipse.ui.contexts.window,,,system) !ENTRY org.eclipse.ui.workbench 4 0 2012-11-23 10:16:10.409 !MESSAGE An unexpected exception was thrown. !STACK 0 java.lang.NullPointerException at org.eclipse.ui.internal.WorkbenchWindow.putToolbarLabel(WorkbenchWindow.java:1697) at org.eclipse.ui.internal.menus.MenuAdditionCacheEntry.createToolBarAdditionContribution(MenuAdditionCacheEntry.java:208) at org.eclipse.ui.internal.menus.MenuAdditionCacheEntry.createContributionItems(MenuAdditionCacheEntry.java:177) at org.eclipse.ui.internal.menus.TrimContributionManager.update(TrimContributionManager.java:224) at org.eclipse.ui.internal.WorkbenchWindow.updateLayoutDataForContents(WorkbenchWindow.java:3874) at org.eclipse.ui.internal.WorkbenchWindow.setCoolBarVisible(WorkbenchWindow.java:3675) at org.eclipse.ui.internal.ViewIntroAdapterPart.setBarVisibility(ViewIntroAdapterPart.java:203) at org.eclipse.ui.internal.ViewIntroAdapterPart.dispose(ViewIntroAdapterPart.java:106) at org.eclipse.ui.internal.WorkbenchPartReference.doDisposePart(WorkbenchPartReference.java:737) at org.eclipse.ui.internal.ViewReference.doDisposePart(ViewReference.java:107) at org.eclipse.ui.internal.WorkbenchPartReference.dispose(WorkbenchPartReference.java:684) at org.eclipse.ui.internal.WorkbenchPage.disposePart(WorkbenchPage.java:1801) at org.eclipse.ui.internal.WorkbenchPage.partRemoved(WorkbenchPage.java:1793) at org.eclipse.ui.internal.ViewFactory.releaseView(ViewFactory.java:257) at org.eclipse.ui.internal.Perspective.dispose(Perspective.java:292) at org.eclipse.ui.internal.WorkbenchPage.dispose(WorkbenchPage.java:1872) at org.eclipse.ui.internal.WorkbenchWindow.closeAllPages(WorkbenchWindow.java:894) at org.eclipse.ui.internal.WorkbenchWindow.hardClose(WorkbenchWindow.java:1729) at org.eclipse.ui.internal.WorkbenchWindow.busyClose(WorkbenchWindow.java:730) at org.eclipse.ui.internal.WorkbenchWindow.access$0(WorkbenchWindow.java:715) at org.eclipse.ui.internal.WorkbenchWindow$6.run(WorkbenchWindow.java:867) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.internal.WorkbenchWindow.close(WorkbenchWindow.java:865) at org.eclipse.jface.window.WindowManager.close(WindowManager.java:109) at org.eclipse.ui.internal.Workbench$18.run(Workbench.java:1114) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.Workbench.busyClose(Workbench.java:1111) at org.eclipse.ui.internal.Workbench.access$15(Workbench.java:1040) at org.eclipse.ui.internal.Workbench$25.run(Workbench.java:1284) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.internal.Workbench.close(Workbench.java:1282) at org.eclipse.ui.internal.Workbench.close(Workbench.java:1254) at org.eclipse.ui.internal.WorkbenchWindow.busyClose(WorkbenchWindow.java:727) at org.eclipse.ui.internal.WorkbenchWindow.access$0(WorkbenchWindow.java:715) at org.eclipse.ui.internal.WorkbenchWindow$6.run(WorkbenchWindow.java:867) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.internal.WorkbenchWindow.close(WorkbenchWindow.java:865) at org.eclipse.jface.window.Window.handleShellCloseEvent(Window.java:741) at org.eclipse.jface.window.Window$3.shellClosed(Window.java:687) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:98) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1276) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1300) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1285) at org.eclipse.swt.widgets.Shell.closeWidget(Shell.java:617) at org.eclipse.swt.widgets.Shell.gtk_delete_event(Shell.java:1191) at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:1750) at org.eclipse.swt.widgets.Control.windowProc(Control.java:5116) at org.eclipse.swt.widgets.Display.windowProc(Display.java:4369) at org.eclipse.swt.internal.gtk.OS._gtk_main_do_event(Native Method) at org.eclipse.swt.internal.gtk.OS.gtk_main_do_event(OS.java:8295) at org.eclipse.swt.widgets.Display.eventProc(Display.java:1192) at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native Method) at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(OS.java:2332) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3177) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:353) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584) at org.eclipse.equinox.launcher.Main.run(Main.java:1438) at org.eclipse.equinox.launcher.Main.main(Main.java:1414) !SESSION 2012-11-23 10:36:07.863 ----------------------------------------------- eclipse.buildId=I20120608-1200 java.version=1.7.0_09 java.vendor=Oracle Corporation BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US Command-line arguments: -os linux -ws gtk -arch x86_64 !ENTRY org.eclipse.jface 2 0 2012-11-23 10:36:13.181 !MESSAGE Keybinding conflicts occurred. They may interfere with normal accelerator operation. !SUBENTRY 1 org.eclipse.jface 2 0 2012-11-23 10:36:13.181 !MESSAGE A conflict occurred for ALT+SHIFT+R: Binding(ALT+SHIFT+R, ParameterizedCommand(Command(oracle.eclipse.tools.common.services.ui.refactor.rename.command,Rename, Rename the selected text., Category(org.eclipse.jdt.ui.category.refactoring,Refactor - Java,Java Refactoring Actions,true), oracle.eclipse.tools.common.services.ui.refactor.internal.ArtifactRefactoringCommandHandler, ,,true),null), org.eclipse.ui.defaultAcceleratorConfiguration, org.eclipse.ui.contexts.window,,,system) Binding(ALT+SHIFT+R, ParameterizedCommand(Command(org.eclipse.jdt.ui.edit.text.java.rename.element,Rename - Refactoring , Rename the selected element, Category(org.eclipse.jdt.ui.category.refactoring,Refactor - Java,Java Refactoring Actions,true), , ,,true),null), org.eclipse.ui.defaultAcceleratorConfiguration, org.eclipse.ui.contexts.window,,,system) !ENTRY org.eclipse.osgi 2 1 2012-11-23 10:39:04.681 !MESSAGE NLS unused message: CacheManager_CannotLoadNonUrlLocation in: org.eclipse.equinox.internal.p2.repository.messages !SESSION 2012-11-23 15:14:12.933 ----------------------------------------------- eclipse.buildId=I20120608-1200 java.version=1.7.0_09 java.vendor=Oracle Corporation BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US Command-line arguments: -os linux -ws gtk -arch x86_64 !ENTRY org.eclipse.jface 2 0 2012-11-23 15:14:23.380 !MESSAGE Keybinding conflicts occurred. They may interfere with normal accelerator operation. !SUBENTRY 1 org.eclipse.jface 2 0 2012-11-23 15:14:23.380 !MESSAGE A conflict occurred for ALT+SHIFT+R: Binding(ALT+SHIFT+R, ParameterizedCommand(Command(oracle.eclipse.tools.common.services.ui.refactor.rename.command,Rename, Rename the selected text., Category(org.eclipse.jdt.ui.category.refactoring,Refactor - Java,Java Refactoring Actions,true), oracle.eclipse.tools.common.services.ui.refactor.internal.ArtifactRefactoringCommandHandler, ,,true),null), org.eclipse.ui.defaultAcceleratorConfiguration, org.eclipse.ui.contexts.window,,,system) Binding(ALT+SHIFT+R, ParameterizedCommand(Command(org.eclipse.jdt.ui.edit.text.java.rename.element,Rename - Refactoring , Rename the selected element, Category(org.eclipse.jdt.ui.category.refactoring,Refactor - Java,Java Refactoring Actions,true), , ,,true),null), org.eclipse.ui.defaultAcceleratorConfiguration, org.eclipse.ui.contexts.window,,,system) !ENTRY org.springframework.ide.eclipse.uaa 4 2 2012-11-23 15:14:32.800 !MESSAGE Problems occurred when invoking code from plug-in: "org.springframework.ide.eclipse.uaa". !STACK 0 java.lang.NullPointerException at org.springframework.ide.eclipse.internal.uaa.monitor.CommandUsageMonitor.startMonitoring(CommandUsageMonitor.java:61) at org.springframework.ide.eclipse.uaa.UaaPlugin$1$1.run(UaaPlugin.java:91) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.springframework.ide.eclipse.uaa.UaaPlugin$1.run(UaaPlugin.java:85) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54) !SESSION 2012-11-23 15:15:21.833 ----------------------------------------------- eclipse.buildId=I20120608-1200 java.version=1.7.0_09 java.vendor=Oracle Corporation BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US Command-line arguments: -os linux -ws gtk -arch x86_64 !ENTRY org.eclipse.jface 2 0 2012-11-23 15:15:27.283 !MESSAGE Keybinding conflicts occurred. They may interfere with normal accelerator operation. !SUBENTRY 1 org.eclipse.jface 2 0 2012-11-23 15:15:27.283 !MESSAGE A conflict occurred for ALT+SHIFT+R: Binding(ALT+SHIFT+R, ParameterizedCommand(Command(oracle.eclipse.tools.common.services.ui.refactor.rename.command,Rename, Rename the selected text., Category(org.eclipse.jdt.ui.category.refactoring,Refactor - Java,Java Refactoring Actions,true), oracle.eclipse.tools.common.services.ui.refactor.internal.ArtifactRefactoringCommandHandler, ,,true),null), org.eclipse.ui.defaultAcceleratorConfiguration, org.eclipse.ui.contexts.window,,,system) Binding(ALT+SHIFT+R, ParameterizedCommand(Command(org.eclipse.jdt.ui.edit.text.java.rename.element,Rename - Refactoring , Rename the selected element, Category(org.eclipse.jdt.ui.category.refactoring,Refactor - Java,Java Refactoring Actions,true), , ,,true),null), org.eclipse.ui.defaultAcceleratorConfiguration, org.eclipse.ui.contexts.window,,,system) !ENTRY org.eclipse.jface 2 0 2012-11-23 15:18:41.265 !MESSAGE Keybinding conflicts occurred. They may interfere with normal accelerator operation. !SUBENTRY 1 org.eclipse.jface 2 0 2012-11-23 15:18:41.265 !MESSAGE A conflict occurred for ALT+SHIFT+E: Binding(ALT+SHIFT+E, ParameterizedCommand(Command(oracle.eclipse.tools.common.services.ui.refactor.rename.command,Rename, Rename the selected text., Category(org.eclipse.jdt.ui.category.refactoring,Refactor - Java,Java Refactoring Actions,true), oracle.eclipse.tools.common.services.ui.refactor.internal.ArtifactRefactoringCommandHandler, ,,true),null), org.eclipse.ui.emacsAcceleratorConfiguration, org.eclipse.ui.contexts.window,,,user) Binding(ALT+SHIFT+E, ParameterizedCommand(Command(org.eclipse.jdt.ui.edit.text.java.rename.element,Rename - Refactoring , Rename the selected element, Category(org.eclipse.jdt.ui.category.refactoring,Refactor - Java,Java Refactoring Actions,true), , ,,true),null), org.eclipse.ui.emacsAcceleratorConfiguration, org.eclipse.ui.contexts.window,,,user) Binding(ALT+SHIFT+E, ParameterizedCommand(Command(org.eclipse.wst.jsdt.ui.edit.text.java.rename.element,Rename - Refactoring , Rename the selected element, Category(org.eclipse.wst.jsdt.ui.category.refactoring,Refactor - JavaScript,JavaScript Refactoring Actions,true), , ,,true),null), org.eclipse.ui.emacsAcceleratorConfiguration, org.eclipse.ui.contexts.window,,,user) !SESSION 2012-11-23 15:18:56.267 ----------------------------------------------- eclipse.buildId=I20120608-1200 java.version=1.7.0_09 java.vendor=Oracle Corporation BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US Command-line arguments: -os linux -ws gtk -arch x86_64 !ENTRY org.eclipse.jface 2 0 2012-11-23 15:19:01.605 !MESSAGE Keybinding conflicts occurred. They may interfere with normal accelerator operation. !SUBENTRY 1 org.eclipse.jface 2 0 2012-11-23 15:19:01.605 !MESSAGE A conflict occurred for ALT+SHIFT+E: Binding(ALT+SHIFT+E, ParameterizedCommand(Command(org.eclipse.wst.jsdt.ui.edit.text.java.rename.element,Rename - Refactoring , Rename the selected element, Category(org.eclipse.wst.jsdt.ui.category.refactoring,Refactor - JavaScript,JavaScript Refactoring Actions,true), , ,,true),null), org.eclipse.ui.emacsAcceleratorConfiguration, org.eclipse.ui.contexts.window,,,user) Binding(ALT+SHIFT+E, ParameterizedCommand(Command(org.eclipse.jdt.ui.edit.text.java.rename.element,Rename - Refactoring , Rename the selected element, Category(org.eclipse.jdt.ui.category.refactoring,Refactor - Java,Java Refactoring Actions,true), , ,,true),null), org.eclipse.ui.emacsAcceleratorConfiguration, org.eclipse.ui.contexts.window,,,user) Binding(ALT+SHIFT+E, ParameterizedCommand(Command(oracle.eclipse.tools.common.services.ui.refactor.rename.command,Rename, Rename the selected text., Category(org.eclipse.jdt.ui.category.refactoring,Refactor - Java,Java Refactoring Actions,true), oracle.eclipse.tools.common.services.ui.refactor.internal.ArtifactRefactoringCommandHandler, ,,true),null), org.eclipse.ui.emacsAcceleratorConfiguration, org.eclipse.ui.contexts.window,,,user)

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• Combining two operators in Evil-mode Emacs

  - by Dyslexic Tangent

  In vim I've remapped > and < when in visual mode to >gv and <gv respectively, like so: vnoremap > >gv vnoremap < <gv Since my target for this question are folks experienced with emacs and not vim, what > and < do is indent/dedent visually selected text. What gv does is reselect the previously selected text. These maps cause > and < to indent/dedent and then reselect the previously selected text. I'm trying out emacs with evil-mode and I'd like to do the same, but I'm having some difficulty figuring out how, exactly, to accomplish the automatic reselection. It looks like I need to somehow call evil-shift-right and evil-visual-restore sequentially, but I don't know how to create a map that will do both, so I tried creating my own function which would call both sequentially and map that instead, but it didn't work, possibly due to the fact that both of them are defined, not as functions with defun but instead as operators with evil-define-operator. I tried creating my own operators: (evil-define-operator shift-left-reselect (beg end) (evil-shift-left beg end) (evil-visual-restore)) (evil-define-operator shift-right-reselect (beg end) (evil-shift-right beg end) (evil-visual-restore)) but that doesn't restore visual as expected. A stab in the dark gave me this: (evil-define-operator shift-left-reselect (beg end) (evil-shift-left beg end) ('evil-visual-restore)) (evil-define-operator shift-right-reselect (beg end) (evil-shift-right beg end) ('evil-visual-restore)) but that selects one additional line whenever it is supposed to reselect. For now I've been using the following, which only has the problem where it reselects an additional line in the < operator. (evil-define-operator shift-right-reselect (beg end) (evil-shift-right beg end) (evil-visual-make-selection beg end)) (evil-define-operator shift-left-reselect (beg end) (evil-shift-left beg end) (evil-visual-make-selection beg end)) and I've mapped them: (define-key evil-visual-state-map ">" 'shift-right-reselect) (define-key evil-visual-state-map "<" 'shift-left-reselect) any help / pointers / tips would be greatly appreciated. Thanks in advance.

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• How do TAB & SHIFT-TAB get reversed in Entourage?

  - by Daryl Spitzer

  In Microsoft Entourage, I can use Tab to move the highlighted selection from "Inbox" in the left-hand column: ...to the list of email in my inbox: And Shift-Tab returns the selection to the left-hand column again. But once-in-a-while when I return to Entourage (but never immediately after launching it), Tab and Shift-Tab are reversed. That is, I need to use Shift-Tab to move the highlighted selection to the list of email and Tab to return the selection to the left-hand column. I don't know what causes this, and I find it so annoying that I'll restart Entourage just to restore Tab and Shift-Tab to what my muscle-memory expects. What is causing them to get reversed, and can I un-reverse them without restarting Entourage?

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• Vista: Alt + Shift + P opens Windows Media Player; how to delete this hotkey?

  - by NotSuper

  I just bought a new laptop, and am having to learn Vista. (My desktop has XP.) I was just trying to set some shortcut keys, and wanted to use Alt + Shift + P for Anywho.com, but to my surprise Alt + Shift + P is already taken. It calls Windows Media Player. Now I like WMP and will use it a lot, but I want my Alt + Shift + P for AnyWho.com. BTW I have PC Magazine's Hotkey Detective 2 (http://www.pcmag.com/article2/0,2817,5082,00.asp), but it doesn't show that Alt + Shift + P is taken. How to do this?

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• Bitshift in javascript

  - by pingvinus

  I've got a really big number: 5799218898. And want to shift it right to 13 bits. So, windows-calculator or python gives me: 5799218898 13 | 100010100100001110011111100001 13 70791 | 10001010010000111 As expected. But Javascript: 5799218898 13 | 100010100100001110011111100001 13 183624 | 101100110101001000 I think it because of internal integer representation in javascript, but cannot find anything about that.

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• Have you ever had to use bit shifting in real projects?

  - by Philip Morton

  Have you ever had to use bit shifting in real programming projects? Most (if not all) high level languages have shift operators in them, but when would you actually need to use them?

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• Java bitshift strangeness

  - by Martin

  Java has 2 bitshift operators for right shifts: >> shifts right, and is dependant on the sign bit for the sign of the result >>> shifts right and shifts a zero into leftmost bits http://java.sun.com/docs/books/tutorial/java/nutsandbolts/op3.html This seems fairly simple, so can anyone explain to me why this code, when given a value of -128 for bar, produces a value of -2 for foo: byte foo = (byte)((bar & ((byte)-64)) >>> 6); What this is meant to do is take an 8bit byte, mask of the leftmost 2 bits, and shift them into the rightmost 2 bits. Ie: initial = 0b10000000 (-128) -64 = 0b11000000 initial & -64 = 0b10000000 0b10000000 >>> 6 = 0b00000010 The result actually is -2, which is 0b11111110 Ie. 1s rather than zeros are shifted into left positions

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• Auto scrolling or shifting a bitmap in .NET

  - by mikej

  I have a .NET GDI+ bitmap object (or if it makes the problem easier a WPF bitmap object) and what I want to to is shift the whole lot by dx,dy (whole pixels) and I would ideally like to do it using .NET but API calls are ok. It has to be efficient bacause its going to be called 10,000 times say with moderately large bitmaps. I have implemented a solution using DrawImage - but its slow and it halts the application for minutes while the GC cleans up the temp objects that have been used. I have also started to work on a version using ScrollDC but so far have had no luck getting it to work on the DC of the bitmap (I can make it work buy creating an API bitmap with bitmap handle, then creating a compatible DC asnd calling ScrollDC but then I have to put it back into the bitmap object). There has to be an "inplace" way of shifting a bitmap. mikej

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• What is the best answer to give for, "Why do you want to change from your present organization?"

  - by Techmaddy

  At present I am into a very good organization. I am planning to shift because I am not happy with the work that I am getting now. I want to work under a different Manager, but my Manager and team is more dependent on me. I tried so many times, but couldn't change my team. So, I started planning to switch my company. Everyone is asking the same question, "Why do you want to change?". Should I say the truth? I told this in 2 places, but did not see a good response from them. Or is there a better answer that I can give?

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• Citrix ICA Client on Mac shift key doesn't work as expected.

  - by brianegge

  When I'm connected to a Windows XP computer from my Mac OS X 10.6 using the Citrix ICA Client, it seems that the shift key only works for the first letter typed after pressing shift. In order to type multiple uppercase letters, like ICA, I must either press caps lock, or press and release shift before each character. I've tried switching between standard and enhanced keyboard, as well as the 'Send Special Keys Unchanged' option, but none of these seem to affect the issue. The problem doesn't occur when I switch from the Citrix window to a regular Mac window.

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• Eclipse keyboard shortcuts: "alt+shift+" vs. "shift+" vs. "ctrl+alt+" etc. -- Is there an underlying

  - by MatrixFrog

  There are a zillion questions on SO about keyboard shortcuts in Eclipse, but there's I've always wondered if there is an underlying logic to the decisions of which shortcuts would be ctrl+alt+[some letter], and which would be just ctrl+[some letter] etc. Obviously there is a need to use a variety of combinations because there are only so many keys on the keyboard, but why, for example, is "add import" ctrl+shift+m, while "extract method" is alt+shift+m, instead of the other way around? I think if there is some underlying logic to these decisions, it will make it easier to remember more shortcuts without having to scan through the huge right-click menus to find them, and I won't accidentally use the wrong one as often.

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• Hide GRUB2 menu UNLESS you hold down Shift key: how to make this happen?

  - by Shasteriskt

  I have a Ubuntu - Windows 7 dual-boot set-up, and I would like to have it that my laptop would boot up Windows 7 unless I press down the Shift key right after boot and bring up the Grub2 menu from which I can choose Ubuntu. I researched on Grub2 and options for etc/default/grub and I have tried playing around with combinations with the GRUB_TIMEOUT and GRUB_HIDDEN_TIMEOUT values, but to no avail. I tried setting the GRUB_HIDDEN_TIMEOUT higher than the GRUB_TIMEOUT thinking that both countdown start simultaneously, but no - GRUB_TIMEOUT only starts after the other is done. Is this behavior achievable? If so, how?

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• How to switch language spellingcheck on the fly when changing keyboard with alt-shift?

  - by Kosmas Papagiannis

  i just recently installed ubuntu 11.04, english version that comes with libreoffice. I also installed Greek language. Is there some way to make Writer recognize my input language (English - Greek) and apply spelling check on the fly, according to my input language? For example, i type a sentence in English, then switch keyboard input (Alt-Shift) and type a sentence in Greek. Writer does no recognize the Greek sentence and underlines it red. MS Office and OO under Windows does it... As soon as you change input language (keyboard layout), the real time spelling checker changes also between languages... Thank you in advance...

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• Why do control keys (ctrl, shift, alt) not work sometimes?

  - by EricSchaefer

  Sometimes (about once a week) the control keys (ctrl, shift, alt) so not work anymore. They do work when I boot up, but after a while they stop working. Logging out and in again repairs it. What can cause something like that? Edit: It just happened again. Incidentally it happened right after vmware-player crashed just as the last time. Coincidence? Edit: It is a laptop keyboard (HP EliteBook 8730w) with german layout.

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• What is the JavaScript >>> operator and how do you use it?

  - by Ken

  I was looking at code from Mozilla that add a filter method to Array and it had a line of code that confused me. var len = this.length >>> 0; I have never seen used in JavaScript before. What is it and what does it do?

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• Circular Shifts on Strings in Bash

  - by Kyle Van Koevering

  I have a homework assignment where I need to take input from a file and continuously remove the first word in a line and append it to the end of the line until all combinations have been done. I really don't know where to begin and would be thankful for any sort of direction. The part that has me confused is that this is suppose to be performed without the use of arrays. I'm not just fishing for someone to solve the problem for me, I'm just looking for some direction. Thank you very much for your time and help. SAMPlE INPUT: Pipes and Filters Java Swing Software Requirements Analysis SAMPLE OUTPUT: Analysis Software Requirements Filters Pipes and Java Swing Pipes and Filters Requirements Analysis Software Software Requirements Analysis Swing Java

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• How can I concatenate upper and lower nibbles stored sequentially in an array?

  - by Abhijit Kumar

  Hi friends, I have an array which contains a list of nibbles: {0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, ...} I want to combine adjacent nibbles into single bytes by left-shifting the upper nibble and concatenating it with the lower one. The output should look as follows: {0xab, 0xcd, 0xef, ...} How can I accomplish this in C?

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• Efficient way to manipulate large powers of two

  - by bguiz

  The most efficient way to code powers of two is by bit shifting of integers. 1 << n gives me 2^(n-1) However, if I have a number that is larger than the largest value allowed in an int, what can I use to efficiently manipulate powers of 2?

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• What is the best way to combine two uints into a ulong in c#

  - by Jason Coyne

  What is the best way to combine two uints into a ulong in c#, setting the high/low uints. I know bitshifting can do it, but I don't know the syntax, or there maybe other APIs to help like BitConverter, but I don't see a method that does what I want.

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• Bitwise Shifting in C

  - by user313943

  I've recently decided to undertake an SMS project for sending and receiving SMS though a mobile. The data is sent in PDU format - I am required to change ASCII characters to 7 bit GSM alphabet characters. To do this I've come across several examples, such as http://www.dreamfabric.com/sms/hello.html This example shows Rightmost bits of the second septet, being inserted into the first septect, to create an octect. Bitwise shifts do not cause this to happen, as will insert to the left, and << to the right. As I understand it, I need some kind of bitwise rotate to create this - can anyone tell me how to move bits from the right handside and insert them on the left? Thanks,

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• How to produce 64 bit masks?

  - by egiakoum1984

  Based on the following simple program the bitwise left shit operator works only for 32 bits. Is it true? #include <iostream> #include <stdlib.h> using namespace std; int main(void) { long long currentTrafficTypeValueDec; int input; cout << "Enter input:" << endl; cin >> input; currentTrafficTypeValueDec = 1 << (input - 1); cout << currentTrafficTypeValueDec << endl; cout << (1 << (input - 1)) << endl; return 0; } The output of the program: Enter input: 30 536870912 536870912 Enter input: 62 536870912 536870912 How could I produce 64-bit masks?

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• Efficient bitshifting an array of int?

  - by nn

  Hi, To be on the same page, let's assume sizeof(int)=4 and sizeof(long)=8. Given an array of integers, what would be an efficient method to bitshift the array to either the left or right? I am contemplating an auxiliary variable such as a long, that will compute the bitshift for the first pair of elements (index 0 and 1) and set the first element (0). Continuing in this fashion the bitshift for elements (index 1 and 2) will be computer, and then index 1 will be set. I think this is actually a fairly efficient method, but there are drawbacks. I cannot bitshift greater than 32 bits. I think using multiple auxiliary variables would work, but I'm envisioning recursion somewhere along the line.

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• ActionScript shiftKey Not Working In Full Screen Mode?

  - by Chunk1978

  i've drawn an ellipse sprite and added it to the display list of a container, which is added to the display list of the stage. to move the sprites with the keyboard arrows, it appears that my shiftModifier:Number variable is not working when the stage's display state is set to full screen. shiftModifier works as it should when the stage's display state is set to Normal. stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyboardDown); function onKeyboardDown(evt:KeyboardEvent):void { var shiftModifier:Number = 0.25; if (evt.shiftKey) {shiftModifier = 10;} if (evt.keyCode == Keyboard.UP) {ellipse1.y -= shiftModifier;} if (evt.keyCode == Keyboard.DOWN) {ellipse1.y += shiftModifier;} if (evt.keyCode == Keyboard.LEFT) {ellipse1.x -= shiftModifier;} if (evt.keyCode == Keyboard.RIGHT) {ellipse1.x += shiftModifier;} } fsm.addEventListener(MouseEvent.CLICK, toggleFullScreenMode); function toggleFullScreenMode(evt:MouseEvent):void { if (stage.displayState == StageDisplayState.FULL_SCREEN) {stage.displayState = StageDisplayState.NORMAL;} else {stage.displayState = StageDisplayState.FULL_SCREEN;} } full screen is tested in Safari and Firefox.

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• Getting value of LSB from Hex (C code)

  - by Rjff

  Hi - first post here :) I've got a code like this in C: unsigned char const data[ ] = {0x0a, 0x1d, 0xf0, 0x07}; I need to extract it such that the final value is: 0xa1df7 I have only been able to extract and get it working if the hex values that have at least 1 zero: unsigned char const data[ ] = {0x0a, 0xd0, 0xf0, 0x07}; using the code below: for(int i = 0; i < SIZE; ++i) { tmp = data[i]; if ( (data[i] <= 0x0F) && (((data[i] & 0x0F) == 0) || (data[i] & 0xF0) == 0)) // one of the hex is zero { tmp = ((tmp << 4) >> 4) << N[i]; std::cout << "foo: " << std::hex << tmp << ":" << std::endl; } else if ((data[i] >= 0x0F) && (((data[i] & 0x0F) == 0) || (data[i] & 0xF0) == 0) ) { tmp = (tmp >> 4) << N[i]; std::cout << "bar: " << std::hex << tmp << ":" << std::endl; } else { std::cout << "result: " << std::hex << result << ":" << std::endl; std::cout << "tmp << 8: " << std::hex << (tmp << 8)<< ":" << std::endl; result = result | (tmp << 8); std::cout << "result |= (tmp << 8): " << std::hex << result << ":" << std::endl; } result |= tmp; std::cout << "boo: " << std::hex << result << ":" << std::endl; } It seems the last else {...} block is troublesome for me. Any ideas? Thanks!

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