Visual C++ :: Should Precompiled Header Files Also Be Included In Source Header Files?

Sep 16, 2013

When including a header file in stdafx.h, should that file still be included in the source file where it is actually used?

If it is included in both places, is the one in the source file ignored?

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C++ :: Precompiled Header Files

Apr 2, 2013

My teacher talks about header files just having definitions and not declerations. I am writing a program that has a .h file and a related .cpp file along with a main.cpp it would be nice to have the .cpp file associated with the .h file compiled into an object file that would than just be referenced when the .h file is included. Am I making any sense?

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C++ :: Including Header Files To Source File?

Jul 10, 2013

For example, I have the below files in a project called Calculate :

Source files : Calculate.cpp , Average.cpp (with out main)
Header files : Calculate.h , Average.h

I knew in general, we have to include Average.h to project header file Calculate.h to make it as part of project.

technical difference between adding header file (Average.h) to either project header file (Calculate.h) or project source file (Calculate.cpp) ?

I found no difference in an output. But, there must be technical difference.

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Visual C++ :: Adding Header And Lib Files At Runtime?

Feb 4, 2013

I was created a dynamic library (Used win32 App) & compiled with no error.

Then i was created my main application (MFC) & paste the .h,.lib,.dll files from the source path(dll App Path) to destination path(Main App Path). If i used the below command in my app means the project working good.

Code:
#include "Alg.h"
#Progma Command(lib, "VTAlg.lib")
& also paste the VTAlg.dll in my app path.

here Alg.h contains the some methods , In future i will edit the function like below for my client requirement but no function name & Arguments change. The changes made in inside function(Logically changed) only.

My client contains only .exe file + .dll file.

My requirement, So after change the method i will send only .dll file to my client

If i change my lib file name VTAlg2.lib instead of VTAlg1.lib (But Same Function name & Arg type)means how can i edit the code below

Code:
#include "Alg.h"
#Progma Command(lib, "VTAlg.lib")

& How to run my application at client place.

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Visual C++ :: Friend Classes In Separate Header Files?

Nov 25, 2012

I am struggling to enable friendship between two classes in separate header files for a banking program.

I am attempting to get the Person class to use variables from the Account class. Heres what I have so far.

ACCOUNT.h:

Code:
#include<iostream>
#include<fstream>
#include<cctype>
#include<iomanip>
#include <string>
#include <math.h>
#include <windows.h>
#include <vector>
#include "Person.h"
using namespace std;
class person;

[code].....

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C :: Header Files Not Found On Mac

Nov 2, 2013

I have a piece of code in C with header files included. I run it on Mac OS X Maverick with XCode 4.6.2 installed. GCC is also installed. Note that Command Line Tools in XCode are already installed.

When I compile it, the error I receive says something like this:

add.c:1:19: error: stdio.h: No such file or directory add.c:2:20: error: stdlib.h: No such file or directory add.c:3:20: error: unistd.h: No such file or directory

However when I run it on Ubuntu, it compiles without a problem.What to do?

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C++ :: Using Namespaces In Header Files

Dec 9, 2013

So I've been making a header file and put variables in their own namespace to avoid conflicts. My question is, do functions in the header file normally go in a namespace too, or should they just be named in a way which makes them unlikely to be accidentally copied?

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C++ :: How To Use Two Header Files In Program

Sep 17, 2013

I want to use two header files in my program. Here is exactly what I want to do.

-In the first header I have a binary tree and a structure.
-In the second file I have another functions that need to use the structure in the first header.
-I also want to use a function from the second header in the first.
-And finally I want to do actions with both headers in a "main.cpp" file that contains only int main() function.

How to include the headers in each other and in the main.cpp to be able to do the actions above?

I try to include the first header in the second one and the second one in the first header. Then I include both headers in the main.cpp file. But the compiler shows me many errors.

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C++ :: Two Header Files - How To Use Namespace

May 2, 2013

I have two header files, A, B.

A.h
namespace test {
struct info
{
int a;
}
}

B.h

#include "A.h"
int main {
test::info.a = 10;
}

However, it has an error. I don't quite understand how to use namespace.

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C++ :: Finding Nested Header Files?

Aug 27, 2013

I'm working with CGAL - Computational Geometry Algorithms Library, which is a library of geometry functions declared as several thousand header-only files. When I run a basic program (source code [URL] ) I get this output: [URL]

I have tried switching angle brackets to quotes. I have also started reading up on CMake.

Do I need to walk the dependency tree and add all of those files to my CMakeLists.txt? Or is there a way to tell the compiler to look in subdirectories?

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C :: How To Deal With Conflicts In Header Files

Nov 6, 2013

I have some header files with generic functions. And in one of them, I define TRUE and FALSE. Recently I started using another header file and it defined TRUE and FALSE as well. That caused GCC to throw an error, and not compile. In my case I can put #IFNDEF around the values so that if it is already defined they don't get defined again, but is there a better way to handle duplicate names? I assume the case would be the same for duplicated functions, how does that get handled?

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C :: Making Header Files With Extension?

Mar 6, 2015

I have a problem with making header files in c, i get the code written only in main.c and then i have to create a files with extension .h and extension .c but how to do it.

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C++ :: Using A Header File Across Multiple Files?

Aug 2, 2014

So say I create a header file which contains a list of structs, and I want to use these structs through out my source and some of my classes... how would I accomplish this?

When I try to do it via #include, I get re-definition errors, due to the nature of #pragma once. If I switch to #ifndef then I lack defenitions in files other than the source.

Is there a way to define things such as structs across multiple files, which doesn't lead to re-definition errors, and doesn't involve manually re-created all the structs for each file?

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C++ :: How To Make Header Files Work

Dec 3, 2013

I'm having with header files, specifically to do with the string data type. The objects work perfectly when I put them inside the .cpp but when I set it to include the exact same code in a .h, I get a string of error messages.

class Topic
{
private:
string NInfo, SInfo, EInfo, WInfo, Name ;
bool Quest ;

[code]....

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C++ :: Where Is The Path For Header Files For Mac Xcode

May 27, 2013

I want to include turboc.h file for some project

where do i have to add this file for mac xcode?

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C++ :: Default Constructors And Header Files?

Jun 8, 2013

I'm working on trying to figure out constructors and header files. Can ya'll help me out with this? I'm sure my code looks like a mess as I tried to piece together different solutions I've found. There's also an attempted copy constructor and operator function. Basically my problem is my source file says there is no default constructor for my class type. Here's my header code:

#include <iostream>
#ifndef _car
#define _car

[Code].....

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C++ :: Creating Header Files With Functions

Oct 30, 2014

I currently have a running program "game.cpp" that runs a game of tic tack toe. I want to split the working functions into header files so that game.cpp isn't so cluttered. I have created two header files "displayBoard.h" and "gamePlay.h" but they wont compile because the functions are looking for variables that haven't been declared. First, here's the working code.

#include "displayBoard.h"
#include <iostream>
#include <limits> //This is required to catch invalid user input
class ticTacToe //A class to contain all our functions {

[Code] .....

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C/C++ :: Linking Classes Through Header Files?

Jul 30, 2014

I am having the issue of trying to call functions of a class through the header file.

Test.h
#ifndef TEST_H
#define TEST_H
class Test {
public:
void Hello();

[code]....

This code returns the error "undefined reference to 'Test::Hello()'"

All I am trying to do is call the Hello(); function in a seperate file.

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C/C++ :: How To Compile Two CPP Files With Header File

Jan 28, 2015

this is my main cpp file:

#include<iostream>
#include<conio.h>
#include "C:UsersAmitDesktopNew foldersum.h"
using namespace std;
int main() {
int a;
int b;

[Code]...

this is my 2nd cpp file add two number

#include<iostream>
#include "C:UsersAmitDesktopNew foldersum.h"
int sum(int x,int y) {
return(x+y);
}

this is my header file used in both cpp file

#ifndef SUM_H
#def SUM_H
int sum(int x,int y);
#endif

error i am getting in main cpp in devc++

[Linker error] undefined reference to `sum(int, int)'
[Linker error] undefined reference to `sum(int, int)'

in 2nd cpp file [Linker error] undefined reference to `WinMain@16' [/code]

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C/C++ :: MSDOS Cannot Include Header Files?

Oct 13, 2012

msdos is present on my computer but it cannot include the header files but when i check all files are present but they still cannot include????????

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C++ :: How To Share Variables Between Two Header Files

Mar 16, 2012

Here is what I did,

Code:
// A.h
const int salary = 1000000;

// B.h
extern const int salary = 1000000;

But I still got multi-definition errors. How should I fix it?

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C :: How To Include Single Header Files Into Project

Oct 2, 2014

I'm a beginner with C and wonder how to include single header files (*.h) in to my project. I mean header files which are not included to the standard installation package.

I thought it would work if I just copy the newheader.h file in to library folder c:MinGWinclude, but it didn't work. Is there some kinf of GCC -command or procedure to add these single header files or how it should work?

All of those standard header files are working well and I don't have any problems with them.

Environment I'm using is MinGW+GCC+Win7.

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C :: Saving Header Files On Memory Stick

Mar 26, 2013

Modify program 3 by saving the header file on your memory stick and remove it from the Header section of the VC++ in the Solutions window.

Code:
#include<stdio.h>
#define pi 3.141592654
#define A (num) * (pi) * (Radius) /* a macro defines a math equation */
float spherevolume (float);
main() {

[Code] ....

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C++ :: How To Change Private Variables In Header Files

Oct 28, 2014

How would I change the private variables in the header files and the code in the cpp files for the primary indexes so they use a dynamic array or vector instead. For the primary index, the initial vector size will be 8.

header

#ifndef MY_PRIMARY_INDEX_H
#define MY_PRIMARY_INDEX_H
#include
#include
#include
#include

class PrimaryIndex

[Code] ....

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C++ :: Including Header Files Located In Two Different Directories

Oct 23, 2013

I have these two files:

/project/protocol/guarddog/report.h

/project/protocol/sky/report.h

I have two report.h files located in two different directories. However the contents of them are different. How can I include the report.h file located in guarddog into the report.h file located in sky?

I assume just doing this would be ambiguous:

#include "report.h"

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C++ :: Why Is It Valid To Include Header Files Twice In A Project

May 12, 2013

if I include iostream twice in my project why is that valid? Wouldn't the linker see that there are two definitions of it and report a error, but it works?

By project I mean in multiple translation units.

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