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// Programmieren 1, Praktikum 4, Aufgabe 3
// Sven Eisenhauer
// 14.12.2004
//
// file: main.cpp
//
// purpose: Analyse multiple rolls of multiple dice
//
#include <iostream>
using std::cin;
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>
void roll(const int, const int, int[]);
void getPara(int &, int &);
void printResultTbl(const int[], const int, const int);
void printResultGrph(const int[], const int, const int);
const int maxDice=20,
maxEyes=6,
minEyes=1;
int main()
{
int nrDice,
nrRolls;
int result[(maxDice*maxEyes)+1]={0};
// initialize random number generator
srand(time(0));
getPara(nrDice,nrRolls);
roll(nrDice,nrRolls,result);
printResultTbl(result, nrDice, nrRolls);
printResultGrph(result, nrDice, nrRolls);
return 0;
}// end main
void getPara(int &nrDice,int &nrRolls)
{
cout << "Please enter number of dice to roll (max. "<<maxDice<<"): ";
cin >> nrDice;
cout << "Please enter number of rolls: ";
cin >> nrRolls;
} // end function getPara
void roll (const int nDice, const int nrRolls, int resultArray[])
{
int sum;
for (int n=1;n<=nrRolls;n++)
{
sum=0;
for (int i=1;i<=nDice;i++)
sum+=(rand()%6)+1;
++resultArray[sum];
}
} // end fnction roll
void printResultTbl(const int resArray[],const int nrDice, const int nrRolls)
{
cout << setw(5) << "Sum" << setw(12) << "Frequency" << setw(20) << "norm. Frequency"<< endl;
for (int n=(nrDice*minEyes);n<=(nrDice*maxEyes);n++)
{
cout << setw(5) << n << setw(12) << resArray[n] << setprecision(2)<< setw(20) << (static_cast <double> (resArray[n]))/nrRolls << endl;
}
}// end function printResultTbl
void printResultGrph(const int resArray[],const int nrDice, const int nrRolls)
{
cout << endl;
const int maxColumns=75;
for (int n=(nrDice*minEyes);n<=(nrDice*maxEyes);n++)
{
cout << setw(2) << n << ": ";
for (int i=0;i<static_cast <int>(((static_cast <double> (resArray[n]))/nrRolls)*maxColumns);i++)
cout<<"*";
cout << endl;
}
}// end function printResultGrph
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