The DO/WHILE statement loops one or many times

The DO/WHILE looping statement iterates one or more times:

DO

Statement 1
Statement 2
…
WHILE control_expression
• Execute the set of statements between the DO and the WHILE, and then repeat while the control_expression tests true at the end of an iteration of the loop.
• When the control_expression tests false at the end of an iteration of the loop, continue execution after the line containing the WHILE; don’t do any more iterations.
• Some statement within the loop must cause some value in the control_expression to change from true to false, otherwise the control_expression will never test false and the looping will never stop.
• Because the control_expression is tested at the end of the loop, the set of statements is always executed at least once, even if the control_expression is false.