class using other files

[nik2]

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

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

asd2.cpp has some functions from class a

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

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

and finally here is the main

#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

  [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

[laserlight]

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

[nik2]

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

when I compile asd2.cpp

i get this error

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

[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:

g++ main.cpp asd2.cpp

[nik2]

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

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 :/