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  • Code crashing compiler: main() returning a struct instead of an int

    - by AndrejaKo
    Hi! I'm experimenting with a piece of C code. Can anyone tell me why is VC 9.0 with SP1 crashing for me? Oh, and the code is meant to be an example used in a discussion why something like void main (void) is evil. struct foo { int i; double d; } main (double argc, struct foo argv) { struct foo a; a.d=0; a.i=0; return a.i; } If I put return a; compiler doesn't crash.

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  • Loss of precision - int -> float or double

    - by stan
    I have an exam question i am revising for and the question is for 4 marks "In java we can assign a int to a double or a float". Will this ever loose infromation and why? I have put that because ints are normally of fixed length or size - the precision for sotring data is finite, where storing information in floating point can be infinite, essentially we loose infromation because of this Now i am a little sketchy as to whetehr or not i am hitting the right areas here. I very sure it will loose precision but i cant exactly put my finger on why. Can i getsome help please Thanks

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  • Java Switch Incompatible Types Boolean Int

    - by ikurtz
    i have the following class: public class NewGameContract { public boolean HomeNewGame = false; public boolean AwayNewGame = false; public boolean GameContract(){ if (HomeNewGame && AwayNewGame){ return true; } else { return false; } } } when i try to use it like so: if (networkConnection){ connect4GameModel.newGameContract.HomeNewGame = true; boolean status = connect4GameModel.newGameContract.GameContract(); switch (status){ case true: break; case false: break; } return; } i am getting the error: incompatible types found: boolean required: int on the following switch (status) code. what am i doing wrong please?

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  • Catch Id (INT AUTO INCREMENT) of a Record after INSERT INTO Statement

    - by Johannes
    This is my first time I use MySQL as datastorage for my C# Application, as I've seen that there is no UNIQUEIDENTIFIER type as in SQL server I decieded to use INT with AUTO_INCREMENT, my problem is now if I execute a INSERT, how may I get the ID of the Record I just added. My quick and dirty solution has been to execute a SELECT MAX(ID) FROM table Statement. But this doesn't seem consistent. I belive there is a better solution something like mysql_insert_id() (PHP). Any Idea how to resolve this in C#?

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  • PHP validating integers

    - by Mikk
    Hi, I was wondering, what would be the best way to validate an integer. I'd like this to work with strings as well, so I could to something like (string)+00003 - (int)3 (valid) (string)-027 - (int)-27 (valid) (int)33 - (int)33 (valid) (string)'33a' - (FALSE) (invalid) That is what i've go so far: function parseInt($int){ //If $int already is integer, return it if(is_int($int)){return $int;} //If not, convert it to string $int=(string)$int; //If we have '+' or '-' at the beginning of the string, remove them $validate = ($int[0] === '-' || $int[0] === '+')?substr($int, 1):$int; //If $validate matches pattern 0-9 convert $int to integer and return it //otherwise return false return preg_match('/^[0-9]+$/', $validate)?(int)$int:FALSE; } As far as I tested, this function works, but it looks like a clumsy workaround. Is there any better way to write this kind of function. I've also tried filter_var($foo, FILTER_VALIDATE_INT); but it won't accept values like '0003', '-0' etc.

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  • Calling this[int index] via reflection

    - by tkutter
    I try to implement a reflection-based late-bound library to Microsoft Office. The properties and methods of the Offce COM objects are called the following way: Type type = Type.GetTypeFromProgID("Word.Application"); object comObject = Activator.CreateInstance(type); type.InvokeMember(<METHOD NAME>, <BINDING FLAGS>, null, comObject, new object[] { <PARAMS>}); InvokeMember is the only possible way because Type.GetMethod / GetProperty works improperly with the COM objects. Methods and properties can be called using InvokeMember but now I have to solve the following problem: Method in the office-interop wrapper: Excel.Workbooks wb = excel.Workbooks; Excel.Workbook firstWb = wb[0]; respectively foreach(Excel.Workbook w in excel.Workbooks) // doSmth. How can I call the this[int index] operator of Excel.Workbooks via reflection?

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  • Are C++ Reads and Writes of an int atomic

    - by theschmitzer
    I have two threads, one updating an int and one reading it. This value is a statistic where the order of the read and write is irrelevant. My question is, do I need to synchronize access to this multi-byte value anyway? Or, put another way, can part of the write be complete and get interrupted, and then the read happen. For example, think of value = ox0000FFFF increment value to 0x00010000 Is there a time where the value looks like 0x0001FFFF that I should be worried about? Certainly the larger the type, the more possible something like this is I've always synchronized these types of accesses, but was curious what the community thought.

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  • manage date fields when are int in the db

    - by Luca Romagnoli
    Hi in my db there is a field "date_start" type integer. This is the part of form for this field <div class="editor-label"> <%: Html.LabelFor(model => model.date_start) %> </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.date_start, new { @class = "calendar" })%> <%: Html.ValidationMessageFor(model => model.date_start) %> </div> In the form i want that the field's format is date type. and memorize it in int type after calling a my function for the convertion. How can i manage it? thanks

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  • Integer v/s int

    - by Siddhartha
    Read this on the oracle docs java.lang page: Frequently it is necessary to represent a value of primitive type as if it were an object. The wrapper classes Boolean, Character, Integer, Long, Float, and Double serve this purpose. I'm not sure I understand why these are needed. It says they have useful functions such as equals(). But if I can do (a==b), why would I ever want to declare them as Integer, use more memory and use equals()? How does the memory usage differ for the 2?

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  • converting from int to hex

    - by Catherine
    I want to convert some ints to hex,but i'm getting something like this : "?|???plL4?h??N{" from 12345. Why? int t = 12345; System.Security.Cryptography.MD5CryptoServiceProvider ano = new System.Security.Cryptography.MD5CryptoServiceProvider(); byte[] d_ano = System.Text.Encoding.ASCII.GetBytes(t.ToString()); byte[] d_d_ano = ano.ComputeHash(d_ano); string st_data1 = System.Text.Encoding.ASCII.GetString(d_d_ano); string st_data = st_data1.ToString(); I'm using it in window form,not in console.

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  • Update int array based on parent

    - by Pickels
    I have the following int[] in my database: '{0}' '{0,0}' '{0,0,0}' '{0,0,0,0}' This column is used to sort my tree data. Now when a parent updates it's order the children should also update. For example if the second record updates it's order to 1 it should result in the following. '{0}' '{0,1}' '{0,1,0}' '{0,1,0,0}' So I was wondering what the query would be to update record 3 and 4. In case it's not clear what I am asking leave a comment I can add additional information. Screenshot of my actual data:

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  • C# wrapper of c++ dll; "Run-Time Check Failure #0 - The value of ESP was not properly saved across a

    - by Deveti Putnik
    Here is the code in C++ dll: extern "C" _declspec(dllexport) int testDelegate(int (*addFunction)(int, int), int a, int b) { int res = addFunction(a, b); return res; } and here is the code in C#: public delegate int AddIntegersDelegate(int number1, int number2); public static int AddIntegers(int a, int b) { return a + b; } [DllImport("tester.dll", SetLastError = true)] public static extern int testDelegate(AddIntegersDelegate callBackProc, int a, int b); public static void Main(string[] args) { int result = testDelegate(AddIntegers, 4, 5); Console.WriteLine("Code returned:" + result.ToString()); } When I start this small app, I get the message from the header of this post. Can someone help, please? Thanks in advance, D

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  • Sending an int from Java to C using sockets

    - by David Morris
    I was just wondering how to send an int from a Java application to a C application using sockets. I have got different C programs communicating with each other and have got the Java application retrieving data from the C application, but I can't work out sending. The C application is acting as database, the Java application then sends a user id (a 4 digit number) to the C application, if it exists it returns that record's details. In Java I have tried using a printWriter and DataOutputStream to send the data, printWriter produces weird symbols and DataOutputStream produces "prof_agent.so". Any help would be appreciated as I don't have a good grasp of sockets at the moment.

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  • Making sure an 'int' is bound on sqlite

    - by iphone_developer
    I have a method called like this... -(void)dbUpdate:(int)forId { Which contains this sqlite to bind and update a database. sqlite3_bind_int(UPDATE_ACCOUNT, 3, forId); When I run the query, it doesn't give me an error, but it doesn't update the database either. If I change this line of code... sqlite3_bind_int(UPDATE_ACCOUNT, 3, forId); manually, to... sqlite3_bind_int(UPDATE_ACCOUNT, 3, 6); the query runs 100% fine, as expected. Changing the variable to an actual integer proves to me that the variable 'forId' isn't being passed or bound to the query properly. What am I doing wrong? How is the best way to pass an Integer (and make sure it is an Integer) into an sqlite bind? Cheers,

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  • [JAVA]Int to String COmmand

    - by Jack.
    I'm trying to make a piece of code that will yell out anything I input. So the command is 'yell' I want to be able to type 'yell (whatever i want here)' and it will yell it out. I've been able to do it with numbers but I can't do it with a String. So how can I go about that? int x = Integer.valueOf(cmd[1]); n.setNextForceTalk(new ForceTalk("Number: " + x)); That piece of code allows me to type 'yell (number)' and it will come out with whatever number I type. But how can I do it with text.

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  • Fluent nhibernate: Enum in composite key gets mapped to int when I need string

    - by Quintin Par
    By default the behaviour of FNH is to map enums to its string in the db. But while mapping an enum as part of a composite key, the property gets mapped as int. e.g. in this case public class Address : Entity { public Address() { } public virtual AddressType Type { get; set; } public virtual User User { get; set; } Where AddresType is of public enum AddressType { PRESENT, COMPANY, PERMANENT } The FNH mapping is as mapping.CompositeId().KeyReference(x => x.User, "user_id").KeyProperty(x => x.Type); the schema creation of this mapping results in create table address ( Type INTEGER not null, user_id VARCHAR(25) not null, and the hbm as <composite-id mapped="true" unsaved-value="undefined"> <key-property name="Type" type="Company.Core.AddressType, Company.Core, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"> <column name="Type" /> </key-property> <key-many-to-one name="User" class="Company.Core.CompanyUser, Company.Core, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"> <column name="user_id" /> </key-many-to-one> </composite-id> Where the AddressType should have be generated as type="FluentNHibernate.Mapping.GenericEnumMapper`1[[Company.Core.AddressType, How do I instruct FNH to mappit as the default string enum generic mapper?

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  • Packing values into a single int

    - by user303907
    Hello, Let's say I have a couple of variables like apple, orange, banana I have 8 apples, 1 orange, 4 bananas. Is it possible to somehow convert those values into a single integer and also revert back to their original values based on the computed integer value? I found an example online. int age, gender, height; short packed_info; . . . // packing packed_info = (((age << 1) | gender) << 7) | height; . . . // unpacking height = packed_info & 0x7f; gender = (packed_info >>> 7) & 1; age = (packed_info >>> 8); But it doesn't seem to work as it should when I entered random numbers.

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  • Reflective Generic Detection

    - by Aren B
    Trying to find out if a provided Type is of a given generic type (with any generic types inside) Let me Explain: bool IsOfGenericType(Type baseType, Type sampleType) { /// ... } Such that: IsOfGenericType(typeof(Dictionary<,>), typeof(Dictionary<string, int>)); // True IsOfGenericType(typeof(IDictionary<,>), typeof(Dictionary<string, int>)); // True IsOfGenericType(typeof(IList<>), typeof(Dictionary<string,int>)); // False However, I played with some reflection in the intermediate window, here were my results: typeof(Dictionary<,>) is typeof(Dictionary<string,int>) Type expected typeof(Dictionary<string,int>) is typeof(Dictionary<string,int>) Type expected typeof(Dictionary<string,int>).IsAssignableFrom(typeof(Dictionary<,>)) false typeof(Dictionary<string,int>).IsSubclassOf(typeof(Dictionary<,>)) false typeof(Dictionary<string,int>).IsInstanceOfType(typeof(Dictionary<,>)) false typeof(Dictionary<,>).IsInstanceOfType(typeof(Dictionary<string,int>)) false typeof(Dictionary<,>).IsAssignableFrom(typeof(Dictionary<string,int>)) false typeof(Dictionary<,>).IsSubclassOf(typeof(Dictionary<string,int>)) false typeof(Dictionary<,>) is typeof(Dictionary<string,int>) Type expected typeof(Dictionary<string,int>) is typeof(Dictionary<string,int>) Type expected typeof(Dictionary<string,int>).IsAssignableFrom(typeof(Dictionary<,>)) false typeof(Dictionary<string,int>).IsSubclassOf(typeof(Dictionary<,>)) false typeof(Dictionary<string,int>).IsInstanceOfType(typeof(Dictionary<,>)) false typeof(Dictionary<,>).IsInstanceOfType(typeof(Dictionary<string,int>)) false typeof(Dictionary<,>).IsAssignableFrom(typeof(Dictionary<string,int>)) false typeof(Dictionary<,>).IsSubclassOf(typeof(Dictionary<string,int>)) false So now I'm at a loss because when you look at the base.Name on typeof(Dictionary) you get Dictionary`2 Which is the same as typeof(Dictionary<,>).Name

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  • C++: Explicit DLL Loading: First-chance Exception on non "extern C" functions

    - by Shiftbit
    I am having trouble importing my C++ functions. If I declare them as C functions I can successfully import them. When explicit loading, if any of the functions are missing the extern as C decoration I get a the following exception: First-chance exception at 0x00000000 in cpp.exe: 0xC0000005: Access violation. DLL.h: extern "C" __declspec(dllimport) int addC(int a, int b); __declspec(dllimport) int addCpp(int a, int b); DLL.cpp: #include "DLL.h" int addC(int a, int b) { return a + b; } int addCpp(int a, int b) { return a + b; } main.cpp: #include "..DLL/DLL.h" #include <stdio.h> #include <windows.h> int main() { int a = 2; int b = 1; typedef int (*PFNaddC)(int,int); typedef int (*PFNaddCpp)(int,int); HMODULE hDLL = LoadLibrary(TEXT("../Debug/DLL.dll")); if (hDLL != NULL) { PFNaddC pfnAddC = (PFNaddC)GetProcAddress(hDLL, "addC"); PFNaddCpp pfnAddCpp = (PFNaddCpp)GetProcAddress(hDLL, "addCpp"); printf("a=%d, b=%d\n", a,b); printf("pfnAddC: %d\n", pfnAddC(a,b)); printf("pfnAddCpp: %d\n", pfnAddCpp(a,b)); //EXCEPTION ON THIS LINE } getchar(); return 0; } How can I import c++ functions for dynamic loading? I have found that the following code works with implicit loading by referencing the *.lib, but I would like to learn about dynamic loading. Thank you to all in advance.

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  • Numeric Order By In Transact SQL (Ordering As String Instead Of Int)

    - by Pyronaut
    I have an issue where I am trying to order a result set by what I believe to be a numberic column in my database. However when I get the result set, It has sorted the column as if it was a string (So alphabetically), instead of sorting it as an int. As an example. I have these numbers, 1 , 2, 3, 4, 5, 10, 11 When I order by in Transact SQL, I get back : 1, 10, 11, 2, 3, 4, 5 I had the same issue with Datagridview's a while back, And the issue was because of the sorting being done as if it was a string. I assume the same thing is happening here. My full SQL code is : SELECT TOP (12) DATEPART(YEAR, [OrderDate]) AS 'Year', DATEPART(MONTH, [OrderDate]) AS 'Month' , COUNT(OrderRef) AS 'OrderCount' FROM [Order] WHERE [Status] LIKE('PaymentReceived') OR [Status] LIKE ('Shipped') GROUP BY DATEPART(MONTH, [OrderDate]), DATEPART(YEAR, [OrderDate]) ORDER BY DATEPART(YEAR, OrderDate) DESC, DATEPART(MONTH, OrderDate) desc DO NOTE The wrong sorting only happens when I cam calling the function from Visual Studio. As in my code is : using (SqlConnection conn = GetConnection()) { string query = @"SELECT TOP (12) DATEPART(YEAR, [OrderDate]) AS 'Year', DATEPART(MONTH, [OrderDate]) AS 'Month' , COUNT(OrderRef) AS 'OrderCount' FROM [Order] WHERE [Status] LIKE('PaymentReceived') OR [Status] LIKE ('Shipped') GROUP BY DATEPART(MONTH, [OrderDate]), DATEPART(YEAR, [OrderDate]) ORDER BY DATEPART(YEAR, OrderDate) DESC, DATEPART(MONTH, OrderDate) desc"; SqlCommand command = new SqlCommand(query, conn); command.CommandType = CommandType.Text; using (SqlDataReader reader = command.ExecuteReader()) etc. When I run the statement in MSSQL server, there is no issues. I am currently using MSSQL 2005 express edition, And Visual Studio 2005. I have tried numerous things that are strewn across the web. Including using Convert() and ABS() to no avail. Any help would be much appreciated.

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  • ActionView::TemplateError (integer 23656121084180 too big to convert to `unsigned int')

    - by jaycode
    Hi, this is the weirdest error I've ever got on Rails. Any idea what this may be is? NOTE: the error DOES NOT come from @order.get_invoice_number, I've tried to separate the code into multiple lines and it was clear the problem is within {:host... } ActionView::TemplateError (integer 23656121084180 too big to convert to `unsigned int') on line #56 of app/views/order_mailer/order_detail.text.html.erb: 53: <b>Order #:</b> 54: </td> 55: <td width="98%"> 56: <%= link_to "#{@order.get_invoice_number}", {:host => Thread.current[:host], :controller => 'store/account', :action => 'view_order', id => "#{@order.id}"}, {:target => '_blank'} %> 57: </td> 58: </tr> 59: <tr> app/views/order_mailer/order_detail.text.html.erb:56 app/controllers/store/ test_controller.rb:11:in `order_email'

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  • Fractional to Decimal Form.

    - by ThePower
    Hi, there probably isn't an answer to this apart from "Create it yourself", but you never know, there might be some string representation for this. Basically, I would like to display number values as fractional instead of decimal when displaying the values as a string. Instead of a value displaying as: 1.1428571428571428571428571428571 I would prefer it to display as 8/7 Is there any way of doing this without writing the functionality myself? Regards Lloyd

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  • Need help in resolving a compiler error: error: invalid conversion from ‘int’ to ‘GIOCondition’

    - by michael
    I have a simple cpp file which uses GIO. I have stripped out everything to show my compile error: Here is the error I get: My.cpp:16: error: invalid conversion from ‘int’ to ‘GIOCondition’ make[2]: *** [My.o] Error 1 Here is the complete file: #include <glib.h> static gboolean read_socket (GIOChannel *gio, GIOCondition condition, gpointer data) { return false; } void createGIOChannel() { GIOChannel* gioChannel = g_io_channel_unix_new(0); // the following is the line causing the error: g_io_add_watch(gioChannel, G_IO_IN|G_IO_HUP, read_socket, NULL); } I have seen other example using gio, and I am doing the same thing in term of calling G_IO_IN|G_IO_HUP. And the documentation http://www.gtk.org/api/2.6/glib/glib-IO-Channels.html, said I only need to include , which I did. Can you please tell me how to resolve my error? One thing I can think of is I am doing this in a cpp file. But g_io_add_watch is a c function? Thank you for any help. I have spent hours on this but did not get anywhere.

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  • Unary NOT/Integersize of the architecture

    - by sid_com
    From "Mastering Perl/Chapter 16/Bit Operators/Unary NOT,~": The unary NOT operator (sometimes called the complement operator), ~, returns the bitwise negation, or 1's complement, of the value, based on integer size of the architecture Why does the following script output two different values? #!/usr/local/bin/perl use warnings; use 5.012; use Config; my $int_size = $Config{intsize} * 8; my $value = 0b1111_1111; my $complement = ~ $value; say length sprintf "%${int_size}b", $value; say length sprintf "%${int_size}b", $complement; Output: 32 64

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  • Cannot convert object, recieved from ajax call, into a long

    - by Matt
    I'm using Asp.Net-Mvc, I have this method in my controller: [AcceptVerbs(HttpVerbs.Post)] public ActionResult LinkAccount(string site, object id) { return this.Json(id); } Here's the ajax method that calls it: $.post("/Account/LinkAccount", { site: "Facebook", id: FB.Facebook.apiClient.get_session().uid }, function(result) { alert(result); }, "json" ); returning this.Json(id); makes the alert work... it alerts 7128383 (something similar to that). but if I change this.Json(id) to this.Json(Conver.ToInt64(id)); the alert does not fire... Any idea of why I can't convert an object received from an object to a long? I already know changing the LinkAccount method to accept a long instead works just fine. It's just I need it as an object because some other sites I'm linking up have strings for id's rather than longs. UPDATE: I tried running the code on localhost so I could set a breakpoint. First I changed the line return this.Json(Convert.ToInt64(id)); to long idAsLong = Convert.ToInt64(id));. Here's what the debugger is telling me: When I hover over id it says: "id | {string[1]}" and when I press the plus button is shows: "[0] | '7128383'" When I hover over idAsLong, it says: "idAsLong | 0" Why isn't it converting it properly?

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