Thread: Function in other file

I have written a code in a file 4.c

Code:

#incldue<stdio.h>

int main() {
     printf("%d",fun(22));
     return 0;
}

and one more code in 5.c

Code:

int fun(double k) {
     return k;
}

And when I compile and run these programs together then it is giving 0 as output , while I was expecting 22.

Now my question is that if arguments of function in other function in other file are different from that of calling place than what would be the behavior of program.

You need to write a header file (.h) with the function prototype for your second function in it, and include the header in your main code, just like you did the stdio.h header...

Code:

// functions.c

int fun(double k) {
     return k;
}

Code:

// functions.h

#ifndef FUNCTIONS_H
#define FUNCTIONS_H

int fun(double k); 


#endif // functions_h

Code:

// main.c

#incldue <stdio.h>
#include "functions.h"

int main() {
     printf("%d",fun(22));
     return 0;
}

Then you need to compile both .c files as part of the same project, and link them together into your executable ... The exact mechanism for that is IDE/Compiler specific so you may want to cruise your help files for answers...