Chapter 5

Flow of Control

• So far our flow of control has been liniear
• We are about to learn control structures
  • Selection - making a one time decision and executing or skipping statements based upon the decision
  • Looping - repeating a series of statements until a condition is met.
• In both cases, we will employ code blocks to group multiple statements into a single statement.
  • Review the convention:
  • All code within a code block is indented by a standard amount.
• Please note, for control structures, I will expect you to be able to give
  • The default syntax
  • The prefered use
  • A description of the flow of control
  • An example of use.

The Bool type

• bool is an integer type, but only two values
• true, false.
• In C it was 0 and not 0
• no real output or input capailities
• Operations: and (&&) , or (||), not(!)
• Do not use the bitwise operations & (and) or | (or)
• Operations that produce booleans ==, !=, <=, < >=, >
• Be careful of = and ==

The If statement

• Two forms
• if ( boolean expression) statement;
• if ( boolean expression) statementA else statementB;
• flow of control