Include problem

[fernandofranca]

I´m using Visual C++ Studio and when I include another .cpp file it doesn´t takes all the what have been included before.

Here is an example:

main.cpp

#include <iostream>
#include <string>
#include <sstream>
#include "readtext.cpp"

int main()
{
 teste();
return 0;
}

//readtext.cpp
void text()
{
	printf("teste");
}

It returns the error;

readtext: : error C3861: 'printf': identifier not found

[daviddoria]

That is because you have not #include <cstdio> Also, you should pretty much never include a .cpp file.

[fernandofranca]

I know that, but I´m new at Visual Studio, so I was trying loads of solutions, this was one of them, I think I´ve copied the worse one, LOL.

Still doesnt work. same error:

error C3861: 'printf': identifier not found

[daviddoria]

This compiles fine for me:

#include <iostream>
#include <cstdio>

int main()
{
 printf("teste");
 return 0;
}

Dave

[fernandofranca]

Let me describe better my problem.

I created a new empty project on MS Visual C++.

Then I created two .cpp files inside it.

Something like that:

/* file1.cpp */

#include <iostream>
#include <cstdio>

int main()
{
 printf("teste");
 functionX();
 return 0;
}

/* end of file1.cpp */

/* file2.cpp */

int functionX()
{  
   printf("Another test");
   return 0;
}

It returns this error;
file2.cpp(3) : error C3861: 'printf': identifier not found

So the includes of the file1.cpp are not being used, or included in file2.cpp

Does anyone knows how to solve this problem?

Thanks for the support.

Fernando

[daviddoria]

Just #include <cstdio> in file2.cpp.

[fernandofranca]

If I remove #include file2.cpp it returns the error, that it´s not supposed to be used of course.
1>------ Build started: Project: testing includes, Configuration: Debug Win32 ------
1>Compiling...
1>file1.cpp
1>c:\users\fernando\documents\visual studio 2008\projects\testing includes\testing includes\file1.cpp(7) : error C3861: 'functionX': identifier not found
1>files2.cpp
1>Generating Code...
1>Build log was saved at "file://c:\Users\Fernando\Documents\Visual Studio 2008\Projects\testing includes\testing includes\Debug\BuildLog.htm"
1>testing includes - 1 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

If I include file2.cpp like #include "file2.cpp"

it returns the error;
1>------ Build started: Project: testing includes, Configuration: Debug Win32 ------
1>Compiling...
1>file1.cpp
1>Compiling manifest to resources...
1>Microsoft (R) Windows (R) Resource Compiler Version 6.0.5724.0
1>Copyright (C) Microsoft Corporation. All rights reserved.
1>Linking...
1>files2.obj : error LNK2005: "int __cdecl functionX(void)" (?functionX@@YAHXZ) already defined in file1.obj
1>C:\Users\Fernando\Documents\Visual Studio 2008\Projects\testing includes\Debug\testing includes.exe : fatal error LNK1169: one or more multiply defined symbols found
1>Build log was saved at "file://c:\Users\Fernando\Documents\Visual Studio 2008\Projects\testing includes\testing includes\Debug\BuildLog.htm"
1>testing includes - 2 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

So gess while building the compiler is not linking file1 with file 2 that´s why the error is happening. do you know how to do that?

[daviddoria]

You absolutely should not #include "file2.cpp" . Since you're using visual studio the linking should be setup automatically for you - but I'll let a VS user reply with the details.

[fernandofranca]

Ok thank you for the support, I´m new on VS so I´m still fighting with it, lol.

[daviddoria]

Please post

File1.cpp

//file1.cpp here

File2.cpp

//file2.cpp here

So the next guy knows where you are so far.

Dave

[fernandofranca]

Here we go, both file are in the same solution of course.

File1.cpp

#include <iostream>
#include <cstdio>


int main()
{
 printf("teste");
 functionX();
 return 0;
}

File2.cpp

#include <cstdio>

int functionX()
{  
   printf("Another test");
   return 0;
}

Visual Studio returns the error:

1>------ Build started: Project: testing includes, Configuration: Debug Win32 ------
1>Compiling...
1>file1.cpp
1>c:\users\fernando\documents\visual studio 2008\projects\testing includes\testing includes\file1.cpp(8) : error C3861: 'functionX': identifier not found
1>Build log was saved at "file://c:\Users\Fernando\Documents\Visual Studio 2008\Projects\testing includes\testing includes\Debug\BuildLog.htm"
1>testing includes - 1 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

As you can see, VS onde compiles file1.cpp =/ .

Fernando.

[nbaztec]

Best practice would be to create a File2.h which defines functionX()& include it:

#include <iostream>
#include <cstdio>
#include "File2.h" //<--
 
 
int main()
{
 printf("teste");
 functionX();
 return 0;
}

else include File2.cpp instead of File2.h there.

[fernandofranca]

Nisheeth Barthwal,

Thank you! That works!!

=) now it included file2.cpp while compiling =)

Thanks Dave and Nisheeth!

Best regards,

Fernando.

[nbaztec]

Glad to be of help, mark this thread Solved please.