primetesterex.cpp

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

void main() {
	int i, n, x;
	i = 2;
	
 while(n > 0) {
	printf( "Input a number. Enter a negative number to exit: ");
	scanf( "%d" , &n);
        if (n < 0)
	  break;
	x = 0;
	while( i <= n) {
		x = n % i;
	int p;
	float m = 1; 
	m = i/n;
	p = m * 100; 
		printf("\rTesting number: %d \t \t", i);

		printf(" %d percent done.", p);  
		if ((x == 0) && (n == i)) {
			printf("\n%d is prime.\n", n);
		        break;
		}
		if ((x == 0) && (n != i)) {
			printf("\n%d is not prime. \n", n);
			break;
		}
		i++;
	}
 }
}