/*
Summary: Check whether a number is prime or not
*/
#include <stdio.h>
int main() {
int n, i, flag=0;
printf("Enter a positive integer: ");
scanf("%d",&n);
for(i=2;i<=n/2;++i) {
if(n%i==0) {
flag=1; break;
}
}
if (flag==0)
printf("%d is a prime number.",n);
else
printf("%d is not a prime number.",n);
return 0;
}
_______________________________OUPUT______________________________
Enter a positive integer: 12
12 is not a prime number.
