C++ Part 13

Types of Control

• Selection: Execute a different instruction depending on the result of evaluating some [Boolean] condition.
• if/else, multiway if, switch, ? :
• Iteration: Repetitively execute some instruction until some condition is met.
•  for, while, do while.

Conditions

A condition is a Boolean expression - i.e., one that evaluates to true or false.
Most commonly either a relational operator or a logical combination of conditions:
Relational (Comparison) Operators:== != < > <= >=
Logical operators:! && ||

For example :  

• n <= 100 && n >= 0  // n less than equal to AND n must be greater than 0
• n< 101 && n >= 0  // n less than 101 AND n greater than equal to 0
• grade> ’c’ && grade <= ’f’ // grade greater than 'c' ( character c ) AND less than equal to 'f'
• y< x && y >= 0   //