C Program for prime no. using function

Program

#include<stdio.h>
int prime(int);
void main()
{
int n,ans;
printf("enter the number:");
scanf("%d",&n);
ans=prime(n);
if(ans==1)
  printf("%d is a prime number.\n",n);
else
  printf("%d is not a prime number.\n",n);
}
int prime(int no)
{
int i;
for(i=2;i<no;i++)
{
if(no%i==0)
        return 0;
        }
return 1;
}

Output

enter the number:7

7 is a prime number.