Lab Description:

This is lab 0.

Code:

begin lab2f12;
  repeat
    stdout.put("Select an option", nl);
    stdout.put("1- Addition", nl);
    stdout.put("2- Subtration", nl);
    stdout.put("3- Multiplication", nl);
    stdout.put("4- Exponentiation", nl);
    stdout.put("5- Exit", nl);
    stdin.get(option);

Screenshots: