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// Programmieren 1, Praktikum 4, Aufgabe 1
// Sven Eisenhauer
// 08.12.2004
//
// file: main.cpp
//
// purpose: Play craps and analyse results
//
//
//
//
#include <iostream>
using std::cout;
using std::endl;
#include <iomanip>
using std::setprecision;
using std::setw;
// contains function prototypes for functions srand and rand
#include <cstdlib>
#include <ctime> // contains prototype for function time
int rollDice( void ); // function prototype
int main()
{
// enumeration constants represent game status
enum Status { CONTINUE, WON, LOST };
int sum;
int myPoint;
const int maxGames=1000000;
const int maxRounds=22;
int round=1,
sumWon=0,
sumLost=0,
wRounds=0;
int nrLost[maxRounds]={0},
nrWon[maxRounds]={0};
Status gameStatus; // can contain CONTINUE, WON or LOST
// randomize random number generator using current time
srand( time( 0 ) );
for (int i=1;i<=maxGames;i++)
{
round=1;
sum = rollDice(); // first roll of the dice
// determine game status and point based on sum of dice
switch ( sum ) {
// win on first roll
case 7:
case 11:
gameStatus = WON;
break;
// lose on first roll
case 2:
case 3:
case 12:
gameStatus = LOST;
break;
// remember point
default:
gameStatus = CONTINUE;
myPoint = sum;
// cout << "Point is " << myPoint << endl;
break; // optional
} // end switch
// while game not complete ...
while ( gameStatus == CONTINUE ) {
sum = rollDice(); // roll dice again
round++;
// determine game status
if ( sum == myPoint ) // win by making point
gameStatus = WON;
else
if ( sum == 7 ) // lose by rolling 7
gameStatus = LOST;
} // end while
// display won or lost message
if ( gameStatus == WON )
//cout << "Player wins" << endl;
if (round<maxRounds)
nrWon[round]++;
else
nrWon[maxRounds-1]++;
else
//cout << "Player loses" << endl;
if (round<maxRounds)
nrLost[round]++;
else
nrLost[maxRounds-1]++;
}
cout << setw(7)<<"Round"<< setw(7)<< "won" << setw(7)<<"lost"<<endl;
for (i=1;i<maxRounds;i++)
{
cout << setw(7) << i << setw(7) << nrWon[i] << setw(7) << nrLost[i] << endl;
sumWon+=nrWon[i];
sumLost+=nrLost[i];
wRounds+=((nrWon[i]*i)+(nrLost[i]*i));
}
cout << endl <<"Total won: " << sumWon << " Total lost: " << sumLost << " Chance to win: "
<< setprecision(4) << (static_cast <double> (sumWon)/maxGames)*100 << "%" << endl;
cout << "Average Game length: "<< setprecision(2) << static_cast <double> (wRounds)/maxGames << " Rounds" << endl;
return 0; // indicates successful termination
} // end main
// roll dice, calculate sum and display results
int rollDice( void )
{
int die1;
int die2;
int workSum;
die1 = 1 + rand() % 6; // pick random die1 value
die2 = 1 + rand() % 6; // pick random die2 value
workSum = die1 + die2; // sum die1 and die2
// display results of this roll
// cout << "Player rolled " << die1 << " + " << die2
// << " = " << workSum << endl;
return workSum; // return sum of dice
} // end function rollDice
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