DifferenceModerate2 marks
State the difference between while and do while loop.
Topic: while and do-while
Previous-year question practice database
Answer
Exam answer
The difference is shown in the table.
Explanation
The essential contrast is WHERE the condition is tested, and the consequence that follows from it — give both. The minimum-number-of-executions point is the one examiners look for: a while loop can run 0 times, a do-while cannot run fewer than 1. Add the semicolon detail if you want the third mark-worthy observation.
Comparison
| while loop | do-while loop |
|---|---|
| Entry-controlled — the condition is tested BEFORE the body is executed. | Exit-controlled — the condition is tested AFTER the body has executed. |
| If the condition is false at the start, the body may run zero times. | The body always executes at least once, whatever the condition. |
| No semicolon after the closing brace. | A semicolon is required after while(condition); |
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