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#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int prize, door_picked, door_opened, door_to_switch, finally_picked_door;
int num_game_played=0;
int num_game_won=0;
float num_won_simulation=0;
float num_simulation=0;
int assigned_door (int x int y);
int final_picked_door (int a, int b, int c);
void game_mode();
void research_mode();
void menu();
int main()
{
/*Generate a seed for generating random numbers in the program*/
srand(time(NULL));
printf("Welcome to the Monty Hall.\n");
menu();
return 0;
}
void game_mode ()
{ int switch_or_not;
/*Prompt the user to pick a door*/
printf("Please enter the door number you want to choose.\nDoor 1 Door 2 Door 3\n");
scanf("%d", &door_picked);
/*Put the prize randomly behind a door 1-3*/
prize=rand()%3+1;
/*Monty Hall opens a door and asks the user if he/she wants to swich*/
door_opened=assign_door (prize, picked_door);
printf("Monty Hall just opened Door %d, and there is no prize behind it.\n Would you like to pick another door? Press 1 for yes; 0 for no.\n", door_opened);
scanf("%d", &switch_or_not);
/*What to do after the user has decided to switch or not: */
door_to_switch = assign_door (picked_door, door_opened);
finally_picked_door=final_picked_door(switch_or_not, picked_door, door_to_switch); /*Assign finally_picked_door to door_to_switch*/
if(finally_picked_door==prize) /*Determine if the user has won and inform the user*/
{
num_game_won++; /*Count the number of wins*/
printf("The prize is behind the door you picked. You have won the game.\n");
}
else
printf("the prize is behind Door %d. You did not win.\n", prize);
num_game_played++; /*Count the number of games played*/
/*Inform the user how many game have been played and how many were won*/
printf("You have played the game %d times and won %d times.\n", num_game_played, num_game_won);
return;
}
void research()
{
int N,switch_in_research;
float chance_of_win=num_won_simulation*100.00/num_simulation;
num_won_simulation=0.0;
num_simulation=0.0;
/*Ask the user how many rounds to simulate*/
printf("Enter the number of game you want to simulate.\n");
scanf("%d", &N);
/*Ask the user what strategy to use*/
printf("Do you want to switch after Monty Hall opens a door? Yes-press 1. No-press 0.\n");
scanf("%d", &switch_in_research);
while(N>num_simulation)
{
prize=rand()%3+1;
door_picked=1;
door_opened=assign_door (prize, picked_door);
door_to_switch = assign_door (picked_door, door_opened);
finally_picked_door=final_picked_door(switch_in_research, picked_door, door_to_switch); /*Assign finally_picked_door to door_to_switch*/
if(finally_picked_door == prize)
num_won_simulation++;
}
if (switch_in_research==1) /*The user decided the switch*/
printf ("The chance of winning if you switch is %f%%\n", chance_of_win);
else/*The user decided not to switch*/
printf ("The chance of winning if you don't switch is %f%%\n", chance_of_win);
return;
}
void menu()
{ int user_choice, while_controller1, while_controller2;
while_controller1=1;
while(while_controller1)
{
printf("You have the following three options:\n1. Game Mode\n2. Research Mode\n3. Exit\n Enter the option you want(1-3).\n");
while_controller2=1;
while(while_controller2)
{
scanf("%d", &user_choice);
switch(user_choice)
{
case 1:
{
game_mode();
while_controller2=0;
break;
}
case 2:
{
research();
while_controller2=0;
break;
}
case 3:
{
while_controller1=0;
while_controller2=0;
break;
}
default:
{
printf("Please enter a valid option");
break;
}
}
}
}
return;
}
/*This function designate the door to be opened by Monty Hall and the door to switch to if the user chooses so*/
int assigned_door (int x int y)
{
int chosen_door=0;
do
{
chosen_door++;
}
while ((chosen_door==x) || (chosen_door==y) ) /*The program tries doors 1-3 until the assigned door is equal to neither of the doors represented by x and y*/
return chosen_door;
}
/*This function designate the door eventually picked by the user after he/she has decided to switch or not*/
int final_picked_door (int a, int b, int c) /*In the program, a will be replaced by the choice of the user on wheter to switch or not; b will be replaced by picked_door; c will be replaced by door_to_switch*/
{
if (a==1) /*The user has decided to switch*/
{
b=c; /*The finally picked door will be the door swtiched to*/
}
else /*The user has decided not to switch*/
{
b=b; /*The finally picked door is still the initially picked door*/
}
return b;
}
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