Stuff

// Commandline options: <iterations> <switch>
// iterations is anything greater than 0; switch is 0 for a player that does _not_ switch
// and nonzero for one who does.
#include <stdio.h>
#include <stdlib.h>

int random_gen(float max);

int main(void) {
	int money, monty, choice_1, choice_2;
	long int wins = 0, losses = 0, trials = 0, i = 0, switch_bool = 0;
	float win_rate = 0.0;

	scanf("%i %i", &trials, &switch_bool);
	if(trials < 0) return(-1);
	for(i = 0; i < trials; ++i) {
		money = random_gen(3);
		choice_1 = random_gen(3);
		monty = random_gen(3);
		while ((monty == money) || (monty == choice_1))
			monty = random_gen(3);
		if(switch_bool) {
			for(choice_2 = 1; (choice_2 == monty) || (choice_2 == choice_1); ++choice_2);
		}
		else choice_2 = choice_1;

		if(choice_2 == money) ++wins;
		else ++losses;
	}
	if(switch_bool)
		printf("Results for player switching doors:\n");
	else
		printf("Results for player not switching doors:\n");
	printf("Of %li trials:  %li wins;  %li losses;  win rate of %f%%\n", trials, wins, losses, (wins*100.0)/trials);
	return(0);
}
int random_gen(float max) {
	return(1+(int) (max*rand()/(RAND_MAX+1.0)));
}