Question

C program:

Your task is to write a program which asks the user for a move (Rock, Paperor Scissors) and then, based on the user’s move, chooses a response (Rock, Paper or Scissors). This process continues until the user decides to exit the game.

If the program “knew” the rules of the game, is would be trivial to make the program choose Paper when the user plays Rock, and Scissors when the user plays Paper, etc. Instead, your program should play randomly at first, and change its play based on previous games, through reinforcement learning.

After every game, the program should output the user’s move, the computer’s move, the outcome (win / draw), and the probability of the computer’s move.

Answer 1

Main.c

#include <stdio.h>

#include <stdlib.h>

#define LENGTH 3

int randomization(double *ptr, int num)

{

  double dbl = rand() / (RAND_MAX + 1.0);

  int x;

  for (x = 0; x < num - 1 && (dbl -= ptr[x]) >= 0; x++);

  return x;

}

int main()

{

  int u_input, comp_input;

  int arr[] = {0, 0, 0};

  const char *arr1[] = { "Rock", "Paper", "Scissors" };

  char str[2];

  const char *wins[] = { "We tied.", "AI wins.", "You win." };

  double ptr[LENGTH] = { 1./3, 1./3, 1./3 };

  while (1) {

    comp_input = randomization(ptr,LENGTH);

    printf("\nYour choice [1-3]:\n"

      " 1. Rock\n 2. Paper\n 3. Scissors\n> ");

   if (!scanf("%d", &u_input)) {

      scanf("%1s", str);

      if (*str == 'q') {

        printf("Your choices [rock : %d , paper : %d , scissors %d] ",arr[0],arr[1], arr[2]);

        return 0;

      }

      continue;

    }

    u_input --;

    if (u_input > 2 || u_input < 0) {

      printf("invalid choice; again\num");

      continue;

    }

    printf("You choose %s; I choose %s. %s\n",

      arr1[u_input], arr1[comp_input],

      wins[(comp_input - u_input + 3) % 3]);

    arr[u_input]++;

  }

}

Output: