PRIME NUMBERS

#include <stdio.h>

int main(){

 int n,i, flag=0;
 scanf("%d", &n);

/*Checking if n is NOT prime */

for(i=2; i<n; i++){
 if(n%i==0){
  flag=1;
 }
}

if(flag==0){
    printf("%d is prime.\n", n);
}
else{
    printf("%d is not prime.\n", n);
}
return 0;
}