Laboratory 2 Solutions

CSCI 132 Data Structures--Spring 2014

Laboratory 2 Solutions
Solution to playLife.cc code:
/*******************************************************************
* Name: Brenda Student
* Date: 1/28/14
* Course: CSCI 132
* Assignment: Lab2
* Instructor: Royden
* Program: playLife.cc
* Purpose:  Program to play Conway's game of life.  Allows user to
* input a configuration and watch as many generations as he/she likes.
***************************************************************************/


#include "life.h"
bool user_says_yes(void);
void instructions(void);

int main()  //  Program to play Conway's game of Life.
  /*
Pre:  The user supplies an initial configuration of living cells.
Post: The program prints a sequence of pictures showing the changes in
      the configuration of living cells according to the rules for
      the game of Life.
Uses: The class Life and its methods initialize(), print(), and update().
      The functions  instructions(),  user_says_yes().
  */

{
  Life configuration;
  instructions();
  configuration.initialize();
  configuration.print();
  cout << "Continue viewing new generations? " << endl;
  while (user_says_yes()) {
    configuration.update();
    configuration.print();
    cout << "Continue viewing new generations? " << endl;
  }
}


void instructions()
  /*
Pre:  None.
Post: Instructions for using the Life program have been printed.
  */

{
  cout << "Welcome to Conway's game of Life." << endl;
  cout << "This game uses a grid of size "
       << maxrow << " by " << maxcol << " in which" << endl;
  cout << "each cell can either be occupied by an organism or not." << endl;
  cout << "The occupied cells change from generation to generation" << endl;
  cout << "according to the number of neighboring cells which are alive."
       << endl;
}

bool user_says_yes()
{
  int c;
  bool initial_response = true;

  do {  //  Loop until an appropriate input is received.
    if (initial_response)
      cout << " (y,n)? " << flush;

      else
        cout << "Respond with either y or n: " << flush;

    do { //  Ignore white space.
      c = cin.get();
    } while (c == '\n' || c ==' ' || c == '\t');
    initial_response = false;
  } while (c != 'y' && c != 'Y' && c != 'n' && c != 'N' && c != -1);
  return (c == 'y' || c == 'Y');
}