IP – Mod 2
Program Control Structures and Analysis
Introduction to Program Control Structures
➢ enable a program not only to do sequential execution but also selection and repetition.
➢ must only be answerable by yes or no
• Selection Structure - execute a decision to alter the flow of the program depending on
some condition(s)
• Repetition Structure - repeats a statement or a group of statements if a certain
condition(s) is still true.
Relational and Logical Operators
➢ Comparison operators since they would make a Boolean (yes or no) decision by comparing the
left hand operand with a right hand operand
• Relational operators - can be used on any simple data type.
• Logical operators - enable you to combine Boolean statements together
- accept logical values (result of a Boolean operation) as operand and produce logical
values as result
o ! - reverse its result
o && - true if both of the right and the left expression are true
o || - true if only one or all of its statements are true.
Selection Structure
• if statement - used for one, two and multiple path selection
• switch - inherently a multiple path structure
→ One way selection structure
