fig04_10.cpp

《c＋＋大学教程》源码

// Fig. 4.10: fig04_10.cpp
// Roll a six-sided die 6000 times.
#include <iostream>

using std::cout;
using std::endl;

#include <iomanip>

using std::setw;

#include <cstdlib>
#include <ctime>

int main()
{
   const int arraySize = 7;
   int frequency[ arraySize ] = { 0 };

   srand( time( 0 ) );  // seed random-number generator

   // roll die 6000 times
   for ( int roll = 1; roll <= 6000; roll++ )       
      ++frequency[ 1 + rand() % 6 ]; // replaces 20-line switch
                                     // of Fig. 3.8

   cout << "Face" << setw( 13 ) << "Frequency" << endl;

   // output frequency elements 1-6 in tabular format
   for ( int face = 1; face < arraySize; face++ )  
      cout << setw( 4 ) << face
           << setw( 13 ) << frequency[ face ] << endl;

   return 0;  // indicates successful termination

} // end main



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