Thread: Program to check whether given number is prime or not?

Hi there, I've written a c program in answer to the following question:

write a function prime that returns 1 if its argument is a prime number and 0 if it is otherwise.
My code is:

Code:

// write a program that returns 1 for prime number and 0 if not prime
//source: stephen kochan, programming in C, chapter 8
#include<stdio.h>


// function to check n is prime or not
void prime (int n)
{
  int i, c = 0;
   
      for (i = 1; i <= n; i++) {
          if (n % i == 0) {
             c++;
          }
      }
      if (c == 2) {
          printf("1\n");
      }
      else {
          printf("0\n");
      }
         
}
int main (void)
{
  void prime (int n);
  int m;
 
 printf("Please Give a number to check whether prime or not\n");
 scanf("%i", &m);
 prime(m);
 return 0;
}

The issue is I'm only printing 1 or 0. How am I supposed to RETURN these values from the function? A little confused, any help would be appreciated.