L-26 MCS 260 Fri 19 Oct 2001

/* L-26 MCS 260 Fri 18 Oct 2001 : play game of paper, rock, scissors

In the program below we play the game of paper, rock, scissors against
the computer.  Each time the user makes a hand, the computer generates
a random choice for the hand.                                   */

enum hand { paper, rock, scissors };
typedef  enum hand  hand;

hand make_hand ( void );
/* asks the user to supply rock, scissors, or paper */

void show_hand ( hand h );
/* prints the value of the hand */

void print_outcome ( hand player, hand adversary );
/* prints the outcome for a game with hands of player and adversary */

void print_win_or_lose ( int i );
/* reports a win if i != 0, a loss if i == 0 */

hand random_hand ( void );
/*  returns at random paper, rock, or scissors */

#include<stdio.h>
#include<stdlib.h>
#include<time.h>

int main(void)
{
   hand player, adversary;
   int ans;

   srand(time(NULL));

   do
   {
      player = make_hand();
      adversary = random_hand();

      printf("\n  player's "); show_hand(player);
      printf("\n  and adversary's "); show_hand(adversary);
      printf("\n  yields "); print_outcome(player,adversary);
      printf("\n\n");

      printf("Exit the game ? (type 1 for yes) ");
      scanf("%d", &ans);
   } while (ans != 1);

   return 0;
}

hand make_hand ( void )
{
   int ans;

   do
   {
      printf("Type 0 for paper, 1 for rock, 2 for scissors : ");
      scanf("%d", &ans);
      switch(ans)
      {
         case 0 : return paper;
         case 1 : return rock;
         case 2 : return scissors;
         default : printf("Invalid choice.  Please try again.\n");
      }
   } while (1);
}

void show_hand ( hand h )
{
   printf("hand is ");
   switch(h)
   {
      case paper    : printf("paper"); break;
      case rock     : printf("rock"); break;
      case scissors : printf("scissors"); break;
      default       : printf("not playing");
   }
}

void print_outcome ( hand player, hand adversary )
{
   if (player == adversary)
      printf("a tie");
   else
      switch(player)
      {
         case paper: print_win_or_lose(adversary == rock);
                     break;
         case rock: print_win_or_lose(adversary == scissors);
                    break;
         case scissors: print_win_or_lose(adversary == paper);
                        break;
         default: printf("abnormal situation.\n");
      }
}

void print_win_or_lose ( int i )
{
   if (i)
      printf("a win");
   else
      printf("a loss");
}

hand random_hand ( void )
{
   int r = rand() % 3;

   return (hand) r;
}

/* L-26 MCS 260 Fri 18 Oct 2001 : play game of paper, rock, scissors

In the program below we play the game of paper, rock, scissors against
the computer.  Each time the user makes a hand, the computer generates
a random choice for the hand.  At the end of the game, the number of
wins, losses, and ties are reported.                               */

enum hand { paper, rock, scissors };
typedef  enum hand  hand;

enum outcome { loss, win, tie };
typedef  enum outcome  outcome;

hand make_hand ( void );
/* asks the user to supply rock, scissors, or paper */

void show_hand ( hand h );
/* prints the value of the hand */

outcome compare ( hand player, hand adversary );
/* returns result of comparison of player with adversary */

void print_outcome ( outcome result );
/* reports a win or a loss */

hand random_hand ( void );
/* returns at random paper, rock, or scissors */

void print_score ( int losses, int wins, int ties );
/* prints the number of losses, wins, and ties */

#include<stdio.h>
#include<stdlib.h>
#include<time.h>

int main(void)
{
   hand player, adversary;
   int ans;
   outcome result;
   int nblosses = 0;
   int nbwins = 0;
   int nbties = 0;

   srand(time(NULL));

   do
   {
      player = make_hand();
      adversary = random_hand();

      result = compare(player,adversary);

      printf("\n  player's "); show_hand(player);
      printf("\n  and adversary's "); show_hand(adversary);
      printf("\n  yields "); print_outcome(result);
      printf("\n\n");

      switch(result)
      {
         case loss : nblosses++; break;
         case win  : nbwins++;   break;
         case tie  : nbties++;   break;
         default   : printf("an error"); 
      }

      printf("Exit the game ? (type 1 for yes) ");
      scanf("%d", &ans);
   } while (ans != 1);

   print_score(nblosses,nbwins,nbties);

   return 0;
}

hand make_hand ( void )
{
   int ans;

   do
   {
      printf("Type 0 for paper, 1 for rock, 2 for scissors : ");
      scanf("%d", &ans);
      switch(ans)
      {
         case 0 : return paper;
         case 1 : return rock;
         case 2 : return scissors;
         default : printf("Invalid choice.  Please try again.\n");
      }
   } while (1);
}

void show_hand ( hand h )
{
   printf("hand is ");
   switch(h)
   {
      case paper    : printf("paper"); break;
      case rock     : printf("rock"); break;
      case scissors : printf("scissors"); break;
      default       : printf("not playing");
   }
}

outcome compare ( hand player, hand adversary )
{
   outcome result;

   if (player == adversary)
      result = tie;
   else
      switch(player)
      {
         case paper: result = (adversary == rock) ? win : loss;
                     break;
         case rock: result = (adversary == scissors) ? win : loss;
                    break;
         case scissors: result = (adversary == paper) ? win : loss;
                        break;
         default: printf("abnormal situation.\n");
      }

   return result;
}

void print_outcome ( outcome result )
{
   switch(result)
   {
      case loss : printf("a loss"); break;
      case win  : printf("a win"); break;
      case tie  : printf("a tie"); break;
      default   : printf("should never occur");
   }
}

hand random_hand ( void )
{
   int r = rand() % 3;

   return (hand) r;
}

void print_score ( int losses, int wins, int ties )
{
   int total = losses + wins + ties;

   printf("\nPlayed %d times :", total);
   printf(" %d lost, %d won, and %d tied.\n\n", losses, wins, ties);
}