primetester.cpp

//#include "iostream.h"
#include "stdio.h"

void main() {
	int i, n, x;
	i = 2;
	printf( "Input number: ");
	scanf( "%d" , &n);
	x = 0;
	while( i <= n) {
		x = n % i;
		if ((x == 0) && (n == i)) {
			printf("\n%d is prime.\n", n);
		return;
		}
		if ((x == 0) && (n != i)) {
			printf("\n%d is not prime. \n", n);
			break;
		}
		i++;
	}
}