/* This file is primemain.c.
Print the prime numbers between 1 and 100, eight per line. */

#include <stdio.h>
#include <stdlib.h>

int isprime(int n);

main()
{
	int n;
	int i = 0;		/* count how many numbers printed so far */

	printf ("The prime numbers from 1 to 100 are:\n");

	for (n = 2; n < 100; ++n) {
		if (isprime(n)) {
			printf ("%5d", n);
			if (++i % 8 == 0) {
				printf ("\n");
			}
		}
	}

	/* If the last number was not followed by a newline, add one now. */
	if (i % 8 != 0) {
		printf ("\n");
	}
	exit (0);
}