KwickClips Java · 41 sec · free
Why is Math.round(-4.5) equal to -4?
Short answer. A half always rounds up, towards the bigger number.
Which method always goes down?
Math.floor.
x = -4.5
| Call | Result |
|---|---|
| Math.ceil(x) | -4.0 |
| Math.floor(x) | -5.0 |
| Math.round(x) | -4 |
Remember
| ceil: up, floor: down |
| round: nearest, half up |
Minus four point five. Three methods, three answers. On a number line, ceil goes up to minus four. Floor goes down to minus five. Round takes the half up, to minus four. Remember. Ceil up, floor down. Round to nearest.
This clip is from the full lesson: Mathematical Library Methods — 7 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 11 Information Technology (802), ICSE Class 9 Computer Applications, ICSE Class 10 Computer Applications, Cambridge IGCSE Grade 10 Computer Science (0478)
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