I'm learning how to build a simple UI in C++ on my Mac (OS 11.6) using Xcode.
As first step I'm compiling the "Hello world" program, my problem is that the build on Xcode fails but write my own command from terminal, instead, works.
This is the program, I'm using SFML :
#include <iostream>
#include "SFML/Graphics.hpp"
int main(int argc, const char * argv[]) {
// insert code here...
std::cout << "Hello, World!\n";
return 0;
}
I have no error here but when launching Run from Xcode this is the output, in Graphics.hpp file :
#include <SFML/Window.hpp>. //'SFML/Window.hpp' file not found
#include <SFML/Graphics/BlendMode.hpp>
#include <SFML/Graphics/CircleShape.hpp
//other header files
This is how the project is structured ("TestGui" is the project name) :
-TestGui.xcodeproj
-TestGui(folder)
--SFML(directory with all headers file available
-- main.cpp
SFML source code here
So I tried to compile it with my own hands from terminal with :
g++ main.cpp -I ./SFML -o main
and
clang++ main.cpp -I ./SFML -o main
In both cases it compiled, also run worked.
Since the error is linked to a file not found I tried to tell it where libraries are located, so in Xcode from Product->Scheme->Edit Scheme->Run->Arguments->Arguments passed on launch : added -I ./SFML. But the error is still alive.
Added SFML folder to targets from Xcode, didn't copy-pasted but maybe I did it wrong, this is my first time.
EDIT : SFML folder:
--SFML
--- many .hpp files
--- 5 folders (Audio, Graphic, Network, System and Window)
I tried to add also this argument : -L ./SFML but nothing.
I have a program with 3 files, and when IrRun the program via Code Runner it keeps printing errors.The icon for the "Log.hpp" file is C, not C++. It doesnt matter if I rename it to Log.h or anything, it seems that I cant create a c++ header file in vscode.
The 3 files are:
main.cpp
#include <iostream>
#include "log.hpp"
using namespace std;
int main() {
InitLog();
Log("Hello World");
return 0;
}
log.cpp
#include "log.hpp"
#include <iostream>
void InitLog() {
Log("Initializing Log");
}
void Log(const char *message) {
std::cout << message << std::endl;
}
log.hpp
#pragma once
void InitLog();
void Log(const char *message);
The error mesages are:
main.cpp: In function 'int main()':
main.cpp:5:5: error: 'InitLog' was not declared in this scope
InitLog();
^~~~~~~
main.cpp:6:5: error: 'Log' was not declared in this scope
Log("Hello World");
Need help.
Are you using Windows? Which compiler? Do you have Microsoft Build Tools installed or even Visual Studio? Are you using gcc or clang?
You must start VS Code from a developer prompt: Open a developer prompt console, navigate to the folder where you code is. Then enter
code .
Visual Studo Code will then open with the environment set up. Then open a terminal inside VSCode using Control-` and try
cl /EHsc main.cpp log.cpp
And it will create main.exe. You can run it in the terminal and it will not close... Next time you open the project you can just open the folder in VS Code, since it would then already have the json config files created
VS Code is just an IDE. So compilers must be installed and also extensions. And some JSON files and tasks must be set up. It is sometimes simple, sometimes not so simple, I believe. But doing that you will then have a powerful editor and an unbelievably flexible environment, since you can for instance run and debug code in nodejs or C or C++ or anything and even in Linux without leaving the session on your casual Windows machine.
Your question is about a specific vscode plugin called Code Runner. It's not really related to vscode. The way how Code Runner is designed will never work for multiple C++ source files. It's not the right tool for the job.
Perhaps you'd better off with Microsofts CMake Tools package for vscode. It does require you to create your own CMakeLists.txt file though. In your case you'd need nothing more than:
add_executable(log
main.cpp
log.cpp
)
I want to switch from Dev-C++ to Eclipse (Version 12/18, 4.10.0) , but I am not able to Compile in Eclipse. I installed MinGW, edited the Pathvariable, restared the PC, installed the C++ Eclipse IDE, created a new Project there I choosed MinGW as my Compiler, and wrote a Hello World.
The Code is:
#include<iosteam>
using namespace std;
int main(){
cout << "Hello World!";
return 0;
}
The Error Message I get is the following:
error: CreateProcess: No such file or directory
What do I need to do to be able to build/run Proramms?
Thanks in advance
You have everything you need to be able to build/run programs. Maybe something is flawed in the configuration. You should separate the tasks to find out the problem.
First try to compile your minimal example by executing g++ from a console like that:
g++ main.cpp. If you get the same error message then you have to fix your Mingw-w64 setup.
If this works, then something is wrong with eclipse. You might want to check different project types. When using Makefile projects, you perhaps have more possibilities to do checks on the console.
I have most bizarre and probably simple to solve problem but it's driving me crazy.
I'm using XCode 4, I've started with an empty project added a new file main.cpp containing:
#include <iostream>
using namespace std;
int main(int argc, const char * argv[]) {
cout << "Hi There!" << endl;
}
Then I added a target called main and added main.cpp to it's sources and compiled and run to be greeted with:
Hello, World!
In return.
Why is XCode adding and compiling it's own main function and how to I tell it to use mine?
It also compiles and runs successfully with an empty main.cpp.
Thanks.
First try cleaning and rebuilding.
If that doesn't work sounds like there is another file with a main in it that is being included in the build.
In the Project File, go into the "Build Phases" tab, and see what is listed under "Compile Sources". The source of your problem might be there.
I am trying to learn c++ but most of the tutorials and books I have read or looked up teaches you this...
(I am assuming like most tutorials, they are teaching in the beginning to code either in win32 console or CLR console. In either case the following does not work.)
#include <iostream>
int main( )
{
std::cout << "Hello World\n";
return (0);
}
The IDE that i have is Visual C++ 2008 Express edition and they accept code like this
#include "stdafx.h"
int _tmain(int argc, _TCHAR* argv[])
{
return 0;
}
Or like this
#include "stdafx.h"
using namespace System;
int main(array<System::String ^> ^args)
{
Console::WriteLine(L"Hello World");
return 0;
}
Honestly I do not no the difference in none of these and I am not sure if I should just download a older compiler so that it works. If someone can tell me what the difference in these are and where to go from there. That will help tremendously. Thanks
[Edited]
I am trying to do a simple hello world. But I get the error "system can not find path specified." I have screenshot that shows what the error looks like. It also is saying that my project is out of date when I clearly save the file before I build it. Apparently it can not find the executable file. I went to the debug fold and did not see any .exe file.
[Edited]
Ok, now When I try to build the project I get the following errors
1>------ Rebuild All started: Project: test, Configuration: Debug Win32 ------
1>Deleting intermediate and output files for project 'test', configuration 'Debug|Win32'
1>Compiling...
1>stdafx.cpp
1>Compiling...
1>test.cpp
1>c:\users\numerical25\desktop\test\test\test.cpp(1) : warning C4627: '#include <iostream>': skipped when looking for precompiled header use
1> Add directive to 'stdafx.h' or rebuild precompiled header
1>c:\users\numerical25\desktop\test\test\test.cpp(6) : error C2653: 'std' : is not a class or namespace name
1>c:\users\numerical25\desktop\test\test\test.cpp(6) : error C2065: 'cout' : undeclared identifier
1>Build log was saved at "file://c:\Users\numerical25\Desktop\test\test\Debug\BuildLog.htm"
1>test - 2 error(s), 1 warning(s)
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========
Here is the code I used
#include <iostream>
#include "stdafx.h"
int main( )
{
std::cout << "Hello World\n";
return (0);
}
Note: I tried using it with and without the #include "stdafx.h" When I tried it without the #include "stdafx.h", it said I might be missing it.
Not sure what you're asking. The first two examples you gave are valid C++ programs that should (will) compile with VC++. The third example is a C++/CLI program that must be compiled with the /CLR compiler switch (this is called Managed C++).
EDIT: Adding more specific information (from a comment below):
The first two examples are standard (native) C++ (albeit, the second example has MS-proprietary macros). They compile to native code. The third is C++/CLI (a "managed" extension to C++). It compiles to managed (.NET) code. Only the third snippet interacts with the .NET framework in any way. All three are absolutely buildable and runnable using the appropriate projects in VS 2008 (no command line necessary)!
Based on your latest update, it looks like you have probably modified some project properties and changed some paths. The app is building, but when you try to run it via VS (you should do this with <Ctrl>+F5, by the way), the executable cannot be found (there are several ways you could have messed this up by changing or playing with various settings).
Please note the difference between building and running. Building is the process of compiling and linking your source code. Running is launching the resulting executable. You seem to be confused between these (judging from your complaints about the "...out of date" dialog box). It is normal to get the "...out of date" dialog box if you try to run without rebuilding after you have made a change to the project (even if that change is saved). Just make sure you click "yes." You need to build the project before you can run it.
My recommendation is to completely delete your project and solution. Create a new empty project, as suggested elsewhere in this now-very-heavyweight thread, and don't modify any project settings. If this doesn't work, something is seriously wrong!
ANOTHER EDIT: Just for completion, since this question kept changing:
As others have already pointed out, your ultimate problem with the first snippet is the use of precompiled headers (PCH). PCH are turned on by default in new VS C++ projects. Their purpose is to speed compilation when many implementation files include the same set of headers -- preventing the compiler from having to parse the header files for each compilation unit.
You have three options:
(Recommended) Disable PCH -- Project Properties --> Configuration Properties --> C/C++ --> Precompiled Headers: Set Create/Use Precompiled Header to Not Using Precompiled Headers. (You don't need to do anything with the "stdafx.h" file or the #include for it.)
Place your commonly used #includes in "stdafx.h". In your case, you would put #include <iostream> in "stdafx.h".
Place your #includes after `#include "stdafx.h". Microsoft requires that the "stdafx.h" be the first included file in a compilation unit.
A minor point, which I don't see elsewhere in the answers: When using precompiled headers, such as your stdafx.h, you need to include them first. Change it to:
#include "stdafx.h"
#include <iostream>
and that should fix the errors about it.
Alternatively, it may be easier to simply switch off precompiled headers: Project > Properties > Configuration Properties > C/C++ > Precompiled Headers > Switch first option to "Not using precompiled headers". They can be useful for big projects but will just be awkward and annoying while you're learning, since they have extra rules (like this "must be included first") which aren't requirements of standard C++ .
The "difference" is pedantic. The latter are just Microsoft-specific entry points.
As you are learning C++, I recommend you use a compiler, and preferably an operating system that lets you focus on C++, and not the platform. For this I recommend g++, on an Linux distribution such as Ubuntu.
Try this tutorial, there are many others that are similar that quickly let you overcome being tied to the tools, and focus on C++.
int main();
int main(int argc, char* argv[]);
These are standard C++.
int _tmain(int argc, _TCHAR* argv[]);
int wmain(int argc, wchar_t* argv[]);
These are Windows-specific to handle Unicode arguments. See What is the difference between _tmain() and main() in C++?.
int main(array<System::String^>^ args);
This is not C++. This is C++/CLI.
For best portability, always use the first form.
Also,
int main(int argc, char** argv, char** envp);
This is a usually seen POSIX extension. Windows supports this form of main too. The envp means (pointer to) environment variables.
int main(int argc, char** argv, char** envp, char** apple);
This is for Mac only, obviously.
void main();
And this is wrong (nonstandard, some compilers (e.g. gcc) will reject it).
Visual C++ Express will compile the first example just fine.
However, you need to ensure the proper project settings:
Create an "Empty Project"
"Add a new item..." to the project via the "Project" menu. Select C++ (.cpp) file.
Copy/Paste code into new file
Press F5 to compile and run.
When "Project is out of date" dialog appears, press "Yes" (build the project)
The steps above ensure VC++ Express does not treat your file as a special Win32/Windows console application.
EDIT: added additional step 5 to prevent "Can't find..." dialog.
I managed to get the same dialog by making sure the exe file does not exist, and answering "No" to the build dialog. With a clean, empty project the exe file does not exist yet. It must be built first. If you answer "no" don't build it, VC++ dutifully does not build the exe and later complains about not being able to find it when it tries to run it later.
As STingRaySC pointed out, all three of your examples will compile in VC2008 express; it's just that examples 2 and 3 are what VC2008 Express will load up initially when you create a project (one of the examples is for Managed C++, as STingRaySC mentioned).
You can just delete the code in your second example (the C++ Win32 Console Application project) and paste in the more standard hello world program from your first example. It should compile and run just fine in VC2008 Express - it did for me.
I. Precompiled header
#include "stdafx.h"
is some kind of tricky stuff that comes your way.
If you create a project VC will normally switch on precompiled header.
This means that one header stdafx.h is created which is compiled only once.
This is done to speed up compile time in big environments. If you start C++
it will confuse you.
If you use stdafx.h it has to be the first header in the cpp file.
II. Unicode (Utf16)
int _tmain(int argc, _TCHAR* argv[])
Microsoft uses UTF16 to implement unicode strings.
This means you get two versions of main.
int main(int argc, char* argv[])
int main(int argc, wchar_t* argv[])
This is also confusing if you start.
To simply start you can use whatever editor you want.
Create the file.
Open a Visdual studio 2008 command prompt
cl main.cpp
main.exe
and you will see Hello World using code from books.
Afterwards try to understand some of the settings of VC.
But you should always use an empty project.
Else you have to care about stdafx, UNICODE, ...
_tmain with the _TCHAR argv is the way the C runtime allows you to handle unicode. If _UNICODE is defined, then _tmain will expand to wmain, and the _TCHAR argument will be of type wchar_t. If _UNICODE is not defined, then _tmain will expand to main, which will be the ANSI standard.
Therefore, so long as _UNICODE is not defined, the second snippet you posted is compliant with the standard.
Lots of waxing lyrical and some misinformation for you sift through already, but I suggest following wonsungi's advice. But to clarify his advice:
File->New->Project
Select Project Type "Win32", then Template "Win32 Console Project"
Give the project a name and location
OK
Select "Application Settings"
Check "Empty Project"
In the "Solution Explorer", right click the "Sources" folder, then Add->New Item
Type the name of the file, in the "name" box using a .cpp extension (you can ignore the templates if you wish).
Enter your code in the new file.
Woot!! I figured it out!!! Below is my original code
#include <iostream>
int main( )
{
std::cout << "Hello World\n";
return (0);
}
It was missing the header file #include "stdafx.h" . So I had to include it in there so I added it like this
#include <iostream>
#include "stdafx.h"
int main( )
{
std::cout << "Hello World\n";
return (0);
}
I was still getting an error like what you see in my edited question at the bottom. So What I did is I took #include and added it in my header file and then it worked!!!!!
Even the the books and alot of tutorials show to add #include to the actual cpp, for some reason in express edition I had to add it to header for it to work. I don't know WHY but it's a solution and now it works.
Download and install Dev-C++ on your system. If the code doesn't work on Visual C++, try it out on Dev-C++ (which uses the GCC compiler). You may get the same results or a different error message. Whenever you get an error message you don't understand, do a Internet search for the error message.