Click here to download vball2.c.

/*****************************************************************
 Volleyball version 2

 This is the current "rally rules" scoring of volleyball that is
 used in the Olympics.

 A game is a series of rallies. Each rally has a winning team,
 and the winning team scores one point. The first team to 25
 points who ALSO has 2 points more than their opponent, wins the
 game.

 In other words, in order to win, you have to have at least 25
 points and you have to have at least 2 points more than the other
 team.
*****************************************************************/
#include "si204.h"

int main() {
  // read in team names
  cstring name1;
  fputs("Team 1 name: ", stdout);
  readstring(name1, stdin);
  cstring name2;
  fputs("Team 2 name: ", stdout);
  readstring(name2, stdin);
  fputs("\n", stdout);

  // set up scores
  int score1 = 0; // current score of team 1
  int score2 = 0; // current score of team 2
  int winat = 25; // how many points needed to win
  int winby = 2;

  // The winning condition is more complicated now, so we use a
  // true/false variable to store whether the game is over.
  int gameover = 0;

  // Stores who wins each rally
  // It's at the outer scope so we can announce the winner at the end!
  cstring winname;

  // play the game until it's over
  while (! gameover) {
    // get winner of next rally
    fputs("Winner of next rally: ", stdout);
    readstring(winname, stdin);

    // update the appropriate score
    if (strcmp(winname, name1) == 0) {
      ++score1;
      // check if team 1 has won
      if (score1 >= winat && score2 <= score1 - winby) {
        gameover = 1;
      }
    } else if (strcmp(winname, name2) == 0) {
      ++score2;
      // check if team 2 has won
      if (score2 >= winat && score1 <= score2 - winby) {
        gameover = 1;
      }
    } else {
      fputs("Invalid team name; please try again.\n", stdout);
    }

    // print out current scores
    fputs(name1, stdout);
    fputs(": ", stdout);
    writenum(score1, stdout);
    fputs(", ", stdout);
    fputs(name2, stdout);
    fputs(": ", stdout);
    writenum(score2, stdout);
    fputs("\n\n", stdout);
  }

  // print out who won
  // Notice: the winname is whoever won the last rally, which must be the
  // same as the overall game winner.
  fputs(winname, stdout);
  fputs(" is the winner!\n", stdout);

  return 0;
}