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// Enter the filename as "game.c"
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#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <DOS.H>
#include <bios.h>

// Global Variables //////////////
char cardoornum, playerchoice, correct;
int ChangeMind[2][2] = {0, 0, 0, 0}, TotalRuns;

// Prototyping ///////////////////
void InitialiseDoors(void);
void AskPlayerForDoor(void);
void PlayerChangesMind(void);
void Statistics(int runs, int CurrentRun);
void Conclusion(int runs, int CurrentRun);

// Functions ////////////////////
void InitialiseDoors(void)
{
	// Set the door with the car
	cardoornum = rand() % 10;
	correct = -1;
}

void AskPlayerForDoor(void)
{
	// Set the player choice
	playerchoice = rand() % 10;
	if (playerchoice == cardoornum) correct = 1;
	else correct = 0;
}

void PlayerChangesMind(void)
{
	// Check if player changes his mind
	char change = rand() % 2;
	if (change == 0)
	{
		if (correct == 1) ChangeMind[0][0]++;
		else ChangeMind[0][1]++;
	} else
	{
		if (correct == 0) ChangeMind[1][0]++;
		else ChangeMind[1][1]++;
	}
}

void Statistics(int runs, int CurrentRun)
{
	double result = 0;
	gotoxy(1,1);
	printf("\nThe total number of runs = %d", runs);
	printf("\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
	printf("\nCurrent run : %d\n", CurrentRun);

	printf("\nIf the player does not change his mind :");
	result = (double)ChangeMind[0][0] / (double)runs * 100.0;
	printf("\n  - Win  : %lf %", result);
	result = (double)ChangeMind[0][1] / (double)runs * 100.0;
	printf("\n  - Lose : %lf %", result);

	printf("\n\nIf the player changes his mind :");
	result = (double)ChangeMind[1][0] / (double)runs * 100.0;
	printf("\n  - Win  : %lf %", result);
	result = (double)ChangeMind[1][1] / (double)runs * 100.0;
	printf("\n  - Lose : %lf %\n", result);
}

void Conclusion(int runs, int CurrentRun)
{
	if (runs == CurrentRun)
	{
	  if (ChangeMind[0][0] > ChangeMind[1][0])
		printf("\nConclusion is that the player should stick to his original choice.");
	  else
	    if (ChangeMind[0][0] == ChangeMind[1][0])
		printf("\nConclusion is that there is no difference.");
	    else
		printf("\nConclusion is that the player should change to the other door.");
	} else
		printf("\nPress spacebar to speed up runs");
}

main()
{
	char c = 'p';

	clrscr();
	srand(200);
	TotalRuns = 10000;
	for (int j=1;j<=TotalRuns;j++)
	{
		InitialiseDoors();
		AskPlayerForDoor();
		PlayerChangesMind();
		// Traps spacebar pressed
		if (bioskey(1) != 0)
			if (c != 32) c = bioskey(0);

		// Skip Statistics & Conclusion if
		// spacebar is pressed, i.e. if c == 32
		if (c != 32)
		{
			Statistics(TotalRuns, j);
			Conclusion(TotalRuns, j);
		}
	}

	// If earlier spacebar was pressed
	// then print the final result.
	if (c == 32)
	{
		Statistics(TotalRuns, TotalRuns);
		Conclusion(TotalRuns, TotalRuns);
	}

	// Pause for user to see final result
	char wait = getch();
}