class using other files

hi im trying to figure out how to make this work

i have main.cpp, asd2.cpp and asd.h

asd.h has the class inside

here is the code

Code:

class a {
      int x;
      public:
             int getX();
             void setX(int);
             };

asd2.cpp has some functions from class a

Code:

#include <iostream>
#include "asd.h"

void a::setX(int b){
     x = b;
     }
int a::getX(){
    return x;
}

and finally here is the main

Code:

#include <iostream>
#include "asd.h"

using namespace std;


int main(void){
   
    a b;
    b.setX(109);
   cout<<b.getX();
   cin.get();
    return 0;
}

im wondering why it doesnt work, it says

Code:

  [Linker error] undefined reference to `a::setX(int)' 
  [Linker error] undefined reference to `a::getX()' 
  ld returned 1 exit status

i think it has something to do with the "include"

does anyone know how to fix this problem? thanks in advance

Perhaps you did not compile asd2.cpp and link to the object file.

Originally Posted by laserlight

Perhaps you did not compile asd2.cpp and link to the object file.

when I compile asd2.cpp

i get this error

Code:

  [Linker error] undefined reference to `WinMain@16' 
  ld returned 1 exit status

Compile separately and then link, or compile both of them and link simultaneously. What compiler are you using? I would guess g++, and thus:

Code:

g++ main.cpp asd2.cpp

Originally Posted by laserlight

Compile separately and then link, or compile both of them and link simultaneously. What compiler are you using? I would guess g++, and thus:

Code:

g++ main.cpp asd2.cpp

ok thanks actually i have Dev C++

i created a new project and it did the linking by itself, i didnt know that i had to create a new project first :/