Thread: calling functions

Hello, I've been having a problem calling functions in C. I've tried just about everything I could think about to make this work. If anybody can help give me an understanding of this I would really appreciate it.

the code:


#include <stdio.h>
main ()
{
int find_max(int, int);
int a, b, total;

a=32;
b=45;
total = find_max(a, b);
printf("the max of the two numbers are %d\n", total);
}

Pretty simple code for finding the maximum number within the program, but this is the compling error I get:


nicholas@nicholas-laptop:~/CProgramming$ gcc functions2.c -o functions2
/tmp/ccfYe8Qe.o: In function `main':
functions2.c.text+0x29): undefined reference to `find_max'
collect2: ld returned 1 exit status

Thanks for any help in advance.

Code:

#include <stdio.h>
main ()
{
int find_max(int, int);
int a, b, total;

a=32;
b=45;
total = find_max(a, b);
printf("the max of the two numbers are %d\n", total);
}

find_max(x,y)

{

if(x>y) return x;
else return y;

}

u cant call a function without defining it.