KwickClips Cyber Safety and Ethics · 41 sec · free
Which loop always runs once?
Short answer. do-while.
When is for best?
When the count is known.
Three loops
| Loop | Checks | At least |
|---|---|---|
| while | before | 0 times |
| do-while | after | 1 time |
| for | before | 0 times |
Remember
| do-while always runs once |
| for: count is known |
The condition is false. Which loop still runs once? Compare the three loops. While checks first, maybe zero. Do while checks after, so at least once. For suits a known count. Do while always runs once. Use for when the count is known.
This clip is from the full lesson: Control Statements in C++: if, switch and Loops — 7 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 10 Information Technology (402), CBSE Class 10 Information Technology (402), ISC Class 11 Computer Science (868), GSEB Std 11 Computer Studies
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