[SOURCE]
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define GOAT 0
#define BMW 1

int _tmain(int argc, _TCHAR* argv[])
{
	long lTests;
	long lRight = 0;									// The number of times staying made you right
	long lWrong = 0;									// The number of times staying makes you wrong
	srand(time(NULL));		// Set the seed for our random number generator to the current time.
	printf("How many test runs would you like to do?\n");
	scanf("%li", &lTests);
	for(long i=0; i<lTests; i++) {
		char pDoors[3];
		memset(pDoors, GOAT, sizeof(char)*3);			// Set's the 3 doors to goats
		int iIndex = rand() % 3;						// Get a random number, either 0, 1, or 2
		pDoors[iIndex] = BMW;							// Set one of the doors to have a BMW
		printf("Door order: ");
		for(int j=0; j<3; j++) {
			if(pDoors[j]==GOAT)
				printf("Goat ");
			else if(pDoors[j]==BMW)
				printf("BMW ");
			else
				printf("System Error ");
		}
		printf("\n");
		int iSelection = 2 - rand() % 3;
		printf("You originally selected door number %d.\n", iSelection);
		int iGiveAway;
		for(;;) {
			iGiveAway = rand() % 3;
			if(iGiveAway!=iSelection && iGiveAway!=iIndex)
				break;
		}
		printf("The host tells you that door %d is a goat.\n", iGiveAway+1);
		for(int i=0; i<3; i++) {
			if(i==iGiveAway) 
				printf("Goat ");
			else
				printf("???? ");
		}
		if(iSelection==iIndex)
			lRight++;
		else
			lWrong++;
		printf("\n");
		printf("\n");
	}
	printf("The number of times staying with your first guess made you right: %li\n", lRight);
	printf("The number of times staying with your first guess made you wrong: %li\n", lWrong);
	return 0;
}


[/SOURCE]