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• How to use gdb to find a floating point exception in g++ code

  - by Phenom

  I have a g++ program that runs without user input. Somewhere the program is interrupted and it says "Floating point exception." Can gdb help me find what's causing this in my code?

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• Getting out of a recursive function at the topmost level in C++

  - by Phenom

  Say that you are several levels deep into a recursive function. The function was originally called in main. Is there a way for you to break out of the recursion and go straight back to main without having to go through all the other functions above?

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• How to make a web game load different files

  - by Phenom

  I play a flash game online and I noticed that some sound files that are used in the game get downloaded to the temporary internet files directory. How can I get the game to use different sounds?

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• Visual C++ 2005 and Windows 7 64-bit

  - by Phenom

  Can Visual C++ 2005 be run in Windows 7 64-bit? I tried installing it, and came up with some problems.

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• Using C++ to find out how many lines are in a text file

  - by Phenom

  My C++ program needs to know how many lines are in a certain text file. I could do it with getline() and a while-loop, but is there a better way?

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• How to assign a string value to a string variable in C++

  - by Phenom

  Shouldn't this work? string s; s = "some string";

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• undefined reference errors in C++

  - by Phenom

  I have files Record.h and Record.cpp. When I just include the Record.h file, I get several undefined reference errors to functions defined in those files. When I also include Record.cpp then the errors go away. Why is that? Record.h has the forward declarations for the functions it says are an undefined reference.

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• number of search accesses

  - by Phenom

  How do you calculate number of accesses for a sequential search if record is present, not present, or sometimes present? What about for binary search?

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• Seeking to a line in a file in g++

  - by Phenom

  Is there a way that I can seek to a certain line in a file to read or write data? Let's say I want to write some data starting on the 10th line in a text file. There might be some data already in the first few lines, or the file could even be empty. Is there a way I can seek directly to the line I want without having to worry about what's already in the file?

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• How to make a struct of structs in C++

  - by Phenom

  Can a struct contain other structs? I would like to make a struct that holds an array of four other structs. Is this possible? What would the code look like?

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• What will this B-tree look like?

  - by Phenom

  The B-tree is of order 4, meaning that it can hold 4 pointers, and 3 keys. The following is inserted: A G I Y Since they can't all fit in one node, I know that the node will split. So I know there's going to be a root node with 2 child nodes after these things are inserted, but I don't know exactly what they'll look like.

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• How many elements can be held in a B-tree of order n?

  - by Phenom

  Is it 2n? Just checking.

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• Why does this B+ tree have repeated elements?

  - by Phenom

  In this B+ tree 5 appears twice.

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• How to modify this c++ code so it doesn't overwrite the whole file

  - by Phenom

  ofstream f("test",app); f.seekp(5,ios::beg); f << "hello world"; f.close(); What I'm trying to do here is open a file that already has data in it, and then put "hello world" somewhere in the middle of the file. However, when I run my code, it overwrites the whole file. How can this code be fixed?

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• What's the best editor/program for g++ in Linux?

  - by Phenom

  So far I've been using vi, but I'm wondering if there's something better to use in Linux. In Windows there's Visual C++, and I guess practically all C++ programmers in Windows use this these days. It has a lot of things in it to help the programmer. What about for Linux?

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• Is modifying a file without writing a new file possible in c++?

  - by Phenom

  Let's say I have a text file that is 100 lines long. I want to only change what is in the 50th line. One way to do it is open the file for input and open a new file for output. Use a for-loop to read in the first half of the file line by line and write to the second file line by line, then write what I want to change, and then write out the second half using a for-loop again. Finally, I rename the new file to overwrite the original file. Is there another way besides this? A way to modify the contents in the middle of a file without touching the rest of the file and without writing everything out again? If there is, then what's the code to do it?

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• How to fix this Makefile

  - by Phenom

  Instead of executable code all it does is create files that don't do anything, even if the files are made executable. TARGETS = load list show add delete btree all: $(TARGETS) %: %.cpp g++ $< -g -o $@ -MM -MF [email protected] sed "s/$@\.o:/$@:/" [email protected] > [email protected] -@rm [email protected] DEPS=$(TARGETS:%=%.d) -include $(DEPS)

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• writing structs and classes to disk

  - by Phenom

  The following function writes a struct to a file. int btwrite(short rrn, BTPAGE *page_ptr) { long addr; addr = (long) rrn * (long) PAGESIZE + HEADERSIZE; lseek(btfd, addr, 0); return (write(btfd, page_ptr, PAGESIZE)); } The following is the struct. typedef struct { short keycount; /* number of keys in page */ int key[MAXKEYS]; /* the actual keys */ int value[MAXKEYS]; /* the actual values */ short child[MAXKEYS+1]; /* ptrs to rrns of descendants */ } BTPAGE; What would happen if I changed the struct to a class, would it still work the same? If I added class functions, would the size it takes up on disk increase?

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• How to create empty buckets in extendible hashing

  - by Phenom

  I know how to do extendible hashing on paper, but I don't know how it's possible for empty buckets to be created. What would cause empty buckets to be created in extendible hashing? Can you show a simple example?

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• How do I add dependencies to this header file

  - by Phenom

  Here is a simple header file for six different programs that used to work right, but then my files also include other files. This needs to get changed so that if the dependencies change the files that include those dependencies get updated. all: load list show add delete btree %: %.cpp g++ $< -g -o $@

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• How to find the byte offset of an object in C++?

  - by Phenom

  Let's say I create 5 objects. Would the byte offset of the first object be 0? How would I find out the byte offset of the other objects?

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• How to read in space-delimited information from a file in c++

  - by Phenom

  In a text file I will have a line containing a series of numbers, with each number separated by a space. How would I read each of these numbers and store all of them in an array?

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• How to make a copy of a char and not a reference in C++

  - by Phenom

  If I declare a function like this: string hash (char* key) then any change I make to key will also change it's value when the function exits, correct? I want to make a copy of it in the function so that I can safely change it without changing the original value. I tried this, but it doesn't work. string temp = key; How can it be done?

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• In B-trees which element gets promoted when the node splits

  - by Phenom

  Let's say there is a B-tree of order 8. This means it can have 8 pointers and 7 elements. Say the letters A through G are stored in this B-tree. So this B-tree is just a single node containing 7 elements. Then you try to insert J into the tree. There's no room, so you have to split the node and create a new root node. Which element gets promoted up into the root node?

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• How do cookies work when browsing websites

  - by Phenom

  On websites where you have to enter a user name and password, I notice that I can browse the site with one browser and it will know who I am no matter where I go on the site. But if I open a different browser it doesn't know who I am in that browser unless I log on in that browser. After I log in to a website, does it store some kind of cookie in my browser, and every time I navigate to a different page on that site, it checks the cookie for my identity? What would happen if I logged in, and then before browsing to a different page on the site, deleted the cookie?

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