pr0621.cpp

practice c++, it is from the book http://www.amazon.com/Schaums-Outline-Programming-John-Hubbard

//  Programming with C++, Second Edition, by John R. Hubbard
//  Copyright McGraw-Hill, 2000
//  Example 6.21 on page 144
//  Tallying frequencies

#include <iostream>  // defines the cout object
using namespace std;

int frequency(float[],int,int);

int main()
{ float a[] = {561, 508, 400, 301, 329, 599, 455, 400, 346, 346,
               329, 375, 561, 390, 399, 400, 401, 561, 405, 405,
               455, 508, 473, 329, 561, 505, 329, 455, 561, 599,
               561, 455, 346, 301, 455, 561, 399, 599, 508, 508};
  int n=40, x;
  cout << "Item: ";
  cin >> x;
  cout << x << " has frequency " << frequency(a,n,x) << endl;
}

int frequency(float a[], int n, int x)
{ int count = 0;
  for (int i=0; i<n; i++)
    if (a[i] == x) ++count;
  return count;
}