fig07_11.cpp

是有关C++编程原理教程的例子程序,全,应该对大家有所帮助

// Fig. 7.11: fig07_11.cpp
// Student poll program.
#include <iostream>
using std::cout;
using std::endl;

#include <iomanip>
using std::setw;

int main()
{
   // define array sizes
   const int responseSize = 40; // size of array responses
   const int frequencySize = 11; // size of array frequency

   // place survey responses in array responses
   const int responses[ responseSize ] = { 1, 2, 6, 4, 8, 5, 9, 7, 8,
      10, 1, 6, 3, 8, 6, 10, 3, 8, 2, 7, 6, 5, 7, 6, 8, 6, 7,
      5, 6, 6, 5, 6, 7, 5, 6, 4, 8, 6, 8, 10 };

   // initialize frequency counters to 0
   int frequency[ frequencySize ] = { 0 };

   // for each answer, select responses element and use that value 
   // as frequency subscript to determine element to increment
   for ( int answer = 0; answer < responseSize; answer++ )
      frequency[ responses[ answer ] ]++;

   cout << "Rating" << setw( 17 ) << "Frequency" << endl;

   // output each array element's value
   for ( int rating = 1; rating < frequencySize; rating++ )
      cout << setw( 6 ) << rating << setw( 17 ) << frequency[ rating ] 
         << endl;

   return 0; // indicates successful termination
} // end main


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