Flow of Control

A Flow of control is the order in which statements are executed.
A Branch lets program choose between two alternatives.

if-else statement:

• Is used in C++ to perform a branch.
• For example:
• if (hours > 40)
• gross_pay = rate * 40 + 1.5 * rate * (hours - 40);
• else
• gross_pay = rate * hours;
• if (boolean expression)
• When the boolean expression is true only the true statement is executed.
• When the boolean expression is false only the false statement is executed.

While-loop:

• When an action must be repeated, a while-loop is used.
• First, the boolean expression is evaluated:
• If false, the program skips to the line following the while loop.
• If true, the body of the loop is executed.
• Syntax:
• while (boolean expression is true);
• {
• statements to repeat
• }

do-while loop:

A variation of the while loop.

A do-while loop is always executed at least once.

The body of the loop is first executed.

The boolean expression is checked after the body has been executed.

 Syntax: 

do

{

statements to repeat 

} 

while (boolean_expression);

Infinite Loop:

• Loops that never stop are infinite loops.
• The loop body should contain a line that will eventually cause the boolean expression to become false.