/*
   testarr08.cpp
   CIS 150
   06/19/2008
   David Klick

   Using an array as a set of accumulators. This program
   sums up the results of double dice rolls.
*/

#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <ctime>
using std::cin;
using std::cout;
using std::setw;

void cont();

int main() {
   int i;
   int die;
   int rolls[13]; // array to hold results of rolls
                  // array has two extra elements because we want
                  //    roll[2] through roll[12], but we will
                  //    automatically get roll[0] and roll[1]
                  //    as well

   // initialize random number generator
   srand(time(0));

   // initialize array to 0s (the elements are accumulators)
   for (i=0; i<13; i++) {
      rolls[i] = 0;
   }
   
   // generate 1000 rolls and tally them
   for (i=0; i<1000; i++) {
      die = rand() % 6 + rand() % 6 + 2;   // simulate 2 dice rolling
      rolls[die]++;      // add 1 to the corresponding accumulator
   }
   
   // display results
   for (i=2; i<13; i++) {
      cout << setw(2) << i << ": " << setw(3) << rolls[i] << '\n';
   }
   
   cont();
   return 0;
}

/*
   void cont();
   
   Arguments: none
   
   Returns: nothing
   
   Clears input buffer and pauses waiting for user 
   to press Enter.
*/
void cont() {
   if (cin.rdbuf()->sungetc() != -1 && cin.get() != '\n') cin.ignore(80,'\n');
   cout << "Press enter to continue...";
   cin.get();
}

/*
   Sample output:
          
    2:  24
    3:  48
    4:  80
    5: 125
    6: 132
    7: 163
    8: 141
    9: 110
   10:  86
   11:  58
   12:  33
*/