#include <iostream.h>

int main() {
   float val, sum, incr, num2;
       int ok, num;
       

cout << "CSE 1020 Christen Sanford ces0152@unt.edu Lab 9" << endl << endl;
       

  do {
cout << "Enter an even number: ";
    cin >> num;
  if (num % 2 == 1 || num < 0)
  cout << "The number " << num << " is not a positive even number." << endl;
     else 
        cout << num << " is even!" << endl << endl;
     } while (num % 2 == 1 || num < 0);

 num2=num;

  incr = 1/num2;
cout << incr << endl;

for (val = 20.0F; val <= 21.0F; val+incr) {
       cout << val << " ";
     sum += val;
     }
     
cout << "The sum is " << sum << endl;
  return 0;

}