C++ Programming/Scope/Examples/Program Average

// Program Average
#include <iostream>
 
using namespace std;
 
float a[10];                      /* a is now in scope.*/
int length;                       /* length is now in scope.*/
 
float average(){
  float result = 0.0;             /* result is now in scope.*/
 
  for(int i = 0; i < length; i++){ /* i is now in scope.*/
    result += a[i];
  }                               /* i is now out of scope.*/
 
  return result/length;
}                                 /* result is now out of scope.*/
 
int main(){
  length = 0;
  cout << "enter a number for each of the next 10 lines" << endl;
 
  while( length != 10 )
    { cin >> a[length++]; }
 
  float av = average();            /* av is now in scope.*/
  cout << endl << "average: " << av << endl;
 
  return 0;
}                                 /* All variables now out of scope.*/