car-n-goat.c

自己做的常用库和实现的数据结构。public domain.

/* Demo of car and goat game, using random number generator.
 *
 * Written by Cyril Hu ([e-mail]), public domain.
 */

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

int main(void)
{
	int i, other, open, max, ch, x[3];

	do {
		puts("Choose one door, 1,2,3?");
		scanf("%d", &ch);
		ch--;
	} while(ch != 1 && ch != 2 && ch != 0);

	srand(time(NULL));
	do {
		x[0] = rand();
		x[1] = rand();
		x[2] = rand();
	} while(x[1]==x[2] || x[0]==x[1] || x[0]==x[2]);

	for(max=i=0; i<3; i++) {
		if(x[max] < x[i])
			max = i;
	}

	for(;;) {
		open = (int)(  3.0 * ( rand() / (RAND_MAX + 1.0) )  );
		other = (int)(  3.0 * ( rand() / (RAND_MAX + 1.0) )  );
		if(other != ch && other != open && open != ch && open != max) {
			printf("Door %d is open, a goat behind it\n", open+1);
			break;
		}
	}
	do {
		printf("Now, Door %d or Door %d ?\n", ch+1, other+1);
		scanf("%d", &i);
		i--;
	} while(i != ch && i != other);

	if(i != max)
		puts("You lose, a goat behind this door");
	else
		puts("You win, a car behind this door");

	return EXIT_SUCCESS;
}