Simple Selection

• At times we need to do one of two (or more) things based on the situation at hand
  • Example:  Driver's licenses
    • 15 1/2 to 16 you get a permit
    • 16 to 18 you get one kind of license
    • 18 to 21 you get another kind
    • 21+ you get a third kind
    • So based on a person's age, the license granting program might need to do different things.
  • Example:  HW#4, second problem
• C++ allows a program to do two different things with the "if - else" statement
  • Syntax:  if (boolean-expression) statement else statement;
  • Example:

    if (hours <= 40)

        pay = hours * wage;

    else

        pay = 40 * wage + (hours - 40) * wage * 1.5;

  • As we shall see in other situations, a single statement can usually be replaced with several statements as long as they are enclosed in braces (such a set of statements is called a "block statement").
• Examples with simple selection:
  • overtime.cpp
  • warning.cpp