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| 1 | #include <iostream> | |
| 2 | #include <cstdio> | |
| 3 | #include <cstdlib> | |
| 4 | #include <ctime> | |
| 5 | using namespace std; | |
| 6 | ||
| 7 | - | int win_changed = 0,win_unchanged = 0; |
| 7 | + | int win_changed = 0,win_unchanged = 0, open_door_choice = 0; |
| 8 | unsigned long long int trials; | |
| 9 | ||
| 10 | int main() | |
| 11 | {
| |
| 12 | cout << "Enter the number of simulations you want to make : "; | |
| 13 | cin >> trials; | |
| 14 | if (trials == 0) | |
| 15 | - | for (unsigned long long int i = 0; i < 1000000000; ++i) |
| 15 | + | |
| 16 | trials = 10000000000; | |
| 17 | } | |
| 18 | srand (time(NULL)); //random number seed will be the current time | |
| 19 | unsigned long long int prize, player_choice, open_door; | |
| 20 | ||
| 21 | ||
| 22 | for (unsigned long long int i = 0; i < trials; ++i) | |
| 23 | - | for (;;) |
| 23 | + | |
| 24 | prize = rand()%3 + 1; | |
| 25 | - | open_door = rand()%3 + 1; |
| 25 | + | |
| 26 | - | if (open_door != prize) |
| 26 | + | |
| 27 | {
| |
| 28 | - | break; |
| 28 | + | |
| 29 | } | |
| 30 | //to open a door | |
| 31 | if (prize != player_choice) | |
| 32 | {
| |
| 33 | for (int i = 1; i < 4; ++i) | |
| 34 | {
| |
| 35 | if (i != prize && i != player_choice) | |
| 36 | {
| |
| 37 | open_door = i; | |
| 38 | break; | |
| 39 | ||
| 40 | } | |
| 41 | } | |
| 42 | } | |
| 43 | else | |
| 44 | {
| |
| 45 | if (open_door_choice == 0) | |
| 46 | {
| |
| 47 | for (int i = 1; i < 4; ++i) | |
| 48 | {
| |
| 49 | if (i != prize) | |
| 50 | {
| |
| 51 | open_door = i; | |
| 52 | open_door_choice = 1; | |
| 53 | break; | |
| 54 | } | |
| 55 | } | |
| 56 | } | |
| 57 | else | |
| 58 | {
| |
| 59 | for (int i = 3; i <= 1; ++i) | |
| 60 | {
| |
| 61 | if (i != prize) | |
| 62 | {
| |
| 63 | open_door = i; | |
| 64 | open_door_choice = 0; | |
| 65 | break; | |
| 66 | } | |
| 67 | } | |
| 68 | } | |
| 69 | } | |
| 70 | ||
| 71 | switch (player_choice) //to change the door | |
| 72 | {
| |
| 73 | case 1: if (open_door == 2) | |
| 74 | - | } |
| 74 | + | |
| 75 | - | |
| 75 | + | |
| 76 | - | |
| 76 | + | |
| 77 | else | |
| 78 | {
| |
| 79 | player_choice = 2; | |
| 80 | } | |
| 81 | break; | |
| 82 | ||
| 83 | case 2: if (open_door == 1) | |
| 84 | {
| |
| 85 | player_choice = 3; | |
| 86 | } | |
| 87 | else | |
| 88 | {
| |
| 89 | player_choice = 1; | |
| 90 | } | |
| 91 | break; | |
| 92 | ||
| 93 | case 3: if (open_door == 2) | |
| 94 | {
| |
| 95 | player_choice = 1; | |
| 96 | } | |
| 97 | else | |
| 98 | {
| |
| 99 | player_choice = 2; | |
| 100 | } | |
| 101 | break; | |
| 102 | } | |
| 103 | if (prize == player_choice) | |
| 104 | {
| |
| 105 | ++win_changed; | |
| 106 | } | |
| 107 | ||
| 108 | ||
| 109 | } | |
| 110 | cout << "Wins when changed = " << win_changed << endl; | |
| 111 | cout << "Wins when not changed = " << win_unchanged << endl; | |
| 112 | return 0; | |
| 113 | ||
| 114 | } |
