One Hundred Doors

OneHundredDoors.c

/* http://rosettacode.org/wiki/100_doors */

#include <stdio.h>

int main()
{
	int x, y;
	int doors[100] = { 0 };

	/* Loop the 100 times */
	for(x = 1; x <= 100; ++x)
		for(y = x; y <= 100; y += x)
			doors[y] = (doors[y] == 1) ? 0 : 1;

	for(x = 1; x <= 100; ++x)
		printf("Door[%d] - %s\r\n", x, (doors[x] == 1) ? "Open" : "Closed");

	return 0;
}