A DICE CLASS - VISUAL C++ VERSION

 

 

// dice.h

/* class for simulating a die to generate an integer random number.

 

dice(int sides) --          constructor, sides specifies number of "sides"

                                       for the die, 2 for a coin, 6 for a regular die, etc.

 

int roll() --          returns the random roll of the die, a (hopefully) uniformly

                             distributed random number between 1 and # of sides

 

int numSides() -- access function, returns # of sides

 

Modeled after a dice class from Owen Astrachan, Duke University.

A Computer Science Tapestry, McGraw Hill, Custom College Series, © 1997.

Last revised, Cary Matsuoka,  5/30/96  */

 

#ifndef _DICE_H

#define _DICE_H

 

/* This version of dice.h requires a different process for initializing the

   random number generator in stdlib.h.  We need to explicitly access the system clock to

   get an initial long integer seed value. */

  

#include <stdlib.h>    // srand() and rand() are inside of stdlib.h

#include <time.h>

#include <limits.h>

 

class dice{

       public:

             dice(int sides);           // constructor

             int roll();              // return the random roll

             int numSides();          // returns number of sides on die

       private:

             int mySides;
int myRollCount;

};                                              // note semicolon after closing brace of class

 

dice::dice(int sides)

// postcondition:  all private fields initialized

// srand() called to set random number generator

{

/*
time = clock();
srand(time % INT_MAX);
*/
srand(time(NULL) % INT_MAX);
myRollCount = 0;
mySides = sides;

}

 

int dice::roll()

// postcondition: # of rolls updated, returns random die roll

{

       return  (rand() % mySides) + 1;    //  adjust value to fit in range 1 - mySides

}

 

int dice::numSides()

// postcondition:  return # of sides of die

{

       return mySides;

}

 

#endif