static.cpp

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// static.cpp
// demonstrates static variables
#include <iostream>
using namespace std;
float getavg(float);        //declaration

int main()
   {
   float data=1, avg;

   while( data != 0 )
      {
      cout << "Enter a number: ";
      cin >> data;
      avg = getavg(data);
      cout << "New average is " << avg << endl;
      }
   return 0;
   }
//--------------------------------------------------------------
// getavg()
// finds average of old plus new data
float getavg(float newdata)
   {
   static float total = 0;  //static variables are initialized
   static int count = 0;    //   only once per program

   count++;                 //increment count
   total += newdata;        //add new data to total
   return total / count;    //return the new average
   }