Programming Challenge 13.12 - Coin Toss Simulator

Example Files: CoinTossSimulator.h
                          CoinTossSimulator.cpp
                          CoinTossSimulatorDm.cpp

CoinTossSimulator.h

/* CoinTossSimulator.h - Specification file for the Coin class. */

#ifndef COIN_TOSS_SIMULATOR_H
#define COIN_TOSS_SIMULATOR_H

#include <string>

class Coin
{
    private:
        std::string  sideUp;                    // The side of the coin facing up
        int             cntHeads;                 // Holds the count for heads
        int             cntTails;                   // Holds the count for tails

    public:
        Coin::Coin() : sideUp(""), cntHeads(0), cntTails(0)    // Constructor
        {
           initRNG();
           toss();
           sideCount();
        }

        void initRNG();                        // Initializes the random number generator
        void toss();                               // Performs a coin-toss
        void sideCount();                     // Counts the number of times heads or tails is facing up

        std::string getSideUp() const       
        { return sideUp; }

        int Coin::getCntHeads() const       
        { return cntHeads; }
       
        int Coin::getCntTails() const
        { return cntTails; }
};
#endif

CoinTossSimulator.cpp

/* CoinTossSimulator.cpp - Implementation file for the Coin class. */

#include <cstdlib>
#include <ctime>
#include "CointTossSimulator.h"

/* **********************************************************
            Coin::initRNG()
    This function initializes the RNG.
   ********************************************************** */

void Coin::initRNG()
{
    srand((unsigned int)time(NULL));
}

/* **********************************************************
            Coin::toss()
    This function determines the coin side facing up after
    each toss. The side facing up is assigned to the sideUp
    member variable.
   ********************************************************** */

void Coin::toss()
{
    const int HEADS = 1;
    const int TAILS = 2;

    unsigned int sides = 0;

    sides = HEADS + rand() % TAILS;

    if (sides == HEADS)
    {
        sideUp = "Heads";
    }
    else
    {
        sideUp = "Tails";
    }
}

/* **********************************************************
            Coin::sideCount()
    This function uses a ternary operator to count the number
    of times 'heads' and 'tails' are facing up.
   ********************************************************** */

void Coin::sideCount()
{
    sideUp == "Heads" ? cntHeads++ : cntTails++;
}

CoinTossSimulatorDm.cpp

/* CoinTossSimulatorDm.cpp - This program demonstrates the Coin class. */

#include <iomanip>
#include <iostream>
#include <string>
#include "CointTossSimulator.h"

using std::cout;
using std::cin;

int main()
{
    Coin coinToss;
   
    const int NUM_TOSSES = 20;
   
    cout << "\t\tCOIN TOSS SIMULATOR\n\n";
    cout << "I will now perform an initial toss.\n\n";
    cout << "The side facing up is: " << coinToss.getSideUp() << "\n\n";
    cout << "I will now toss the coin " << NUM_TOSSES << " times.";

    cout << "\n(Press a key to continue)\n";
    cin.ignore();

    for (int i = 0; i < 20; i++)
    {
        coinToss.toss();
        coinToss.sideCount();

        cout << "Toss #" << std::setw(2)  << (i + 1) << ": "
                              << std::setw(18) << coinToss.getSideUp() << "\n";
    }

    cout << "\nThe number of times 'Heads' was facing up: " << coinToss.getCntHeads() << "\n";
    cout << "The number of times 'Tails' was facing up: "   << coinToss.getCntTails();
    cout << "\n\nThis program will now exit. Have a nice day!";
   
    cin.ignore();
    return 0;
}

Example Output: