ex7.cpp

// Solution to Exercise 7
// (NDE, 2014-01-03)
#include <iostream>
using namespace std;
int main()
{
  double x, y;
  cout << "Enter two numbers in range 0 to 100: ";
  cin >> x >> y;
  if (x < 0 || x > 100) {
    cerr << "Error: first number out of range" << endl;
    return 1;
  }
  if (y < 0 || y > 100) {
    cerr << "Error: second number out of range" << endl;
    return 1;
  }
  double average = (x + y) / 2;
  cout << "Average = " << average << endl;
  return 0;
}