KwickClips Java · 40 sec · free
How can a loop run when the condition is false?
Short answer. In a do-while, the condition is checked after the body has already run once.
Which loop may run zero times?
while, because it checks before the body.
while vs do-while
| Point | while | do-while |
|---|---|---|
| Checks | first | last |
| Type | entry | exit |
| Min runs | 0 | 1 |
Remember
| while: entry controlled |
| do-while: runs at least once |
The condition is false, but the loop still runs once. How? While checks first, so it may run zero times. Do while checks last. It is exit controlled, so it runs once. While is entry controlled. Do while runs at least once.
This clip is from the full lesson: Loops in Java: for, while and do-while — 6 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: ICSE Class 9 Computer Applications, ICSE Class 9 Computer Applications, ICSE Class 9 Computer Applications, ISC Class 11 Computer Science (868)
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