Header file problem

Question

I have a problem in separating class file in vs code
The header file don't work when I compile .. the class object of header file dont work and compiler show me error
any idea can help me to fix this problem?

Answer 1

Maybe post the codes here?

Answer 2

Martin Taylor I don't understand. The asker has only declared `int main()` in Class.cpp

Issam Seghir
I think the problem is that in `console.cpp`, you have only included "Class.h", where the Car2 class is declared , but you have not included "Class.cpp" where you have defined the methods of the Car2 class.

Answer 3

My main file : (consol.cpp)
👇👇
// Consol.cpp : This file contains the 'main' function. Program execution begins and ends there.

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

#include <iostream>
#include <string>
#include "Class.h"
using namespace std;
int main()
{
Car2 car2;
cout << ".............................................................................." << endl
<< "This is Car 2 in Header file with initial value to Constructor Car2();" << endl
<< " name of car 2 : "
<< car2.printname2() << endl
<< " model of car 2 : " << car2.printmod2() << endl
<< ".............................................................................."
<< endl; return 0;
}

Answer 4

My separated class file :
Class.cpp
👇👇

#include <iostream>
#include <string>
#include "Class.h"

int main();
void Car2::scanname2(string name2)
{
name2 = name;
}
string Car2::printname2() {
return name;
}
void Car2:: scanmod2(int model2) {
model2 = model;
}
int Car2:: printmod2() {
return model;
}
Car2::Car2() : model(1598), name ("Volkswagen")
{

} Car2::~Car2()
{
}

Answer 5

Header file ( Class.h) :
👇👇

// #pragma once

#include <string>
using namespace std ;

#ifndef CLASS_H
#define CLASS_H
class Car2
{
private:
int model;
string name;
public:
void scanname2(string name2);
string printname2();
void scanmod2(int model2);
int printmod2();
Car2(); // constructor it's special method ( no return , same name of class)
~Car2();

};
#endif

Answer 6

Error message in console.cpp :
⚠️⚠️
> Executing task: C/C++: g++.exe build active file <

Starting build...
Build finished with errors(s):
C:\Users\S8A8A~1.ISS\AppData\Local\Temp\ccqYXWsM.o: In function `main':
C:/Users/S.issam/Desktop/C++/consolaplication2/consol.cpp:141: undefined reference to `Car2::Car2()'
C:/Users/S.issam/Desktop/C++/consolaplication2/consol.cpp:145: undefined reference to `Car2::printname2[abi:cxx11]()'
C:/Users/S.issam/Desktop/C++/consolaplication2/consol.cpp:146: undefined reference to `Car2::printmod2()'
C:/Users/S.issam/Desktop/C++/consolaplication2/consol.cpp:141: undefined reference to `Car2::~Car2()'
C:/Users/S.issam/Desktop/C++/consolaplication2/consol.cpp:141: undefined reference to `Car2::~Car2()'
collect2.exe: error: ld returned 1 exit status

The terminal process terminated with exit code: -1.

Answer 7

Error message in class.cpp :
⚠️⚠️
> Executing task: C/C++: g++.exe build active file <

Starting build...
Build finished with errors(s):
C:/Program Files/mingw-w64/x86_64-8.1.0-posix-seh-rt_v6-rev0/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/lib/../lib/libmingw32.a(lib64_libmingw32_a-crt0_c.o):crt0_c.c:(.text.startup+0x2e): undefined reference to `WinMain'
collect2.exe: error: ld returned 1 exit status

The terminal process terminated with exit code: -1.

Answer 8

Martin Taylor I delete int main
And still the same problem

Answer 9

XXX Uh man, thank you very much , u solve my problem

Answer 10

Martin Taylor sorry if I'm wrong, but in Consol.cpp, the OP has only declared the main function, not defined it right?(sorry also if I've got the terms wrong. I don't know what a function declaration without a definition is called)
`int main();`

About the second error, yeah I forgot to mention that and also, I didn't know what that meant until you told in your answer.
Issam Seghir you should see Martin Taylor's answer and the code given by him.

(Also, a question for Martin Taylor, don't mentions work on the web version of SL or is it a bug that in your answers I always see "@XXX" instead of a mention)

EDIT:
just read your latest answer and sorry, I thought that was the problem because in the error message, only the methods that were called in the main function were shown. So I just thought that it is because their definition is not complete.