KwickClips Java · 43 sec · free
Why 7.0 and not 7?
Short answer. sqrt returns a double, so the decimal part is shown.
Does abs return a double?
No. It keeps the type it receives, so an int gives an int.
Four Math methods
| Call | Result |
|---|---|
| Math.sqrt(49) | 7.0 |
| Math.cbrt(27) | 3.0 |
| Math.pow(2, 3) | 8.0 |
| Math.abs(-7) | 7 |
Remember
| sqrt, cbrt, pow: double |
| abs keeps the type |
Root of forty nine prints seven point zero. Why? Square root gives seven point zero. Cube root gives three point zero. Pow gives eight point zero. Abs of an int stays an int. Remember. These three return double. Abs keeps its type.
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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