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

#define XOR 1
#define AND 2
#define OR 3

int main ()
{
	int number;
	int op;
	int guess;
	int count = 0;
	int res, bitcount, mask;
	srand (time (0));
	number = rand () & 255;
	op = 1 + rand () % 3;

	while (1) {
		printf ("Bitte eine Zahl (0-255) raten: ");
		if ((scanf ("%d", &guess) != 1) || (guess < 0)
		    || (guess > 255)) {
			printf ("Was fuer eine komische Zahl\n");
			continue;
		}
		count ++;
		if (guess == number)
			break;
		switch (op) {
		case AND:
			res = number & guess;
			break;
		case OR:
			res = number | guess;
			break;
		case XOR:
			res = number ^ guess;
			break;
		}
		bitcount = 0;
		for (mask = 1; mask <= 255; mask <<= 1) {
			if (res & mask)
				bitcount++;
		}
		printf ("Hinweis fuer %d: %d\n", guess, bitcount);
	}
	assert (guess == number);
	printf ("%d wurde nach %d Versuchen erraten\n", guess, count);
	return 0;
}