Click here to download vball3.c.

/*****************************************************************
 Volleyball version 3

 This is the "old rules" of volleyball prior to the adoption of
 the current rally system.

 Every rally has a serving team (initially team 1), and the
 serving team is the only one that can score. So if the serving
 team wins the rally, they get one point, but if the other team
 wins the rally, the don't get any points. However, whoever
 wins each rally gets to serve the next rally.

 Because games are lower-scoring, you only play to 15 points.
 However, you still have to win by 2 points. So the winner is
 the first team to have at least 15 points and at least 2 points
 more than their opponent.
*****************************************************************/
#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 = 15; // how many points needed to win
  int winby = 2;  // how many points you have to win over your opponent

  // which team is serving
  cstring serving;
  strcpy(serving, name1);

  // 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(serving, stdout);
    fputs(" is serving.  Winner of next rally: ", stdout);
    readstring(winname, stdin);

    // only score a point if you were serving
    if (strcmp(winname, serving) == 0) {
      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;
        }
      }
    }

    // whoever wins the rally serves the next one
    strcpy(serving, winname);

    // 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;
}