Number API Functions
This document lists most useful (and most often needed) functions. Be aware, that there are many more to be found in either the class references or via the builtin class browser.
Reference: Integer Float Fraction FixedPoint Complex which all inherit from Number
Testing[Bearbeiten]
Check if number is not infinity and not NaN:
aNumber isFinite => Boolean
Check if number is either positive infinity (INF) or negative infinity (-INF):
aNumber isInfinite => Boolean
Check if number is NaN ("Not a Number"):
aNumber isNaN => Boolean
Sign checks:
aNumber negative => Boolean; same as aNumber < 0 aNumber positive => Boolean; same as aNumber >= 0 aNumber strictlyPositive => Boolean; same as aNumber > 0
Misc Properties:
anInteger isPrime => Boolean anInteger isPowerOf2 => Boolean; (true if there exists an n, such that 2ˆn equals the number) anInteger isPowerOf:x => Boolean; (true if there exists an n, such that xˆn equals the number)
Queries
anInteger nextPrime => anInteger anInteger nextPowerOf2 => anInteger
Arithmetic[Bearbeiten]
The usual arithmetic operators. Notice, that they are evaluated left to right, without special precedences. Thus you should always use parentheses to group expressions when are than one operator is in an arithmetic expression.
aNumber + aNumber => Number aNumber - aNumber => Number aNumber * aNumber => Number aNumber / aNumber => Number
Truncated result (towards the next smaller integer i.e. towards negative infinity):
aNumber // aNumber => Integer
Examples:
100 // 3 => 33
-100 // 3 => -34
