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instansmetoder
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Arithmetic operations
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Performs various arithmetic operations on flt.
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flt
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+ |
aNumeric
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Addition |
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flt
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-- |
aNumeric
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Subtraction |
|
flt
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* |
aNumeric
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Multiplication |
|
flt
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/ |
aNumeric
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Division |
|
flt
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% |
aNumeric
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Modulo |
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flt
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** |
aNumeric
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Exponentiation |
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<=>
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flt <=> aNumeric
-> -1, 0, +1
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Returns -1, 0, or +1 depending on whether flt is less
than, equal to, or greater than aNumeric. This is the
basis for the tests in Comparable.
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ceil
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flt.ceil -> anInteger
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Returns the smallest Integer greater than or equal to flt.
1.2.ceil
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» |
2
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2.0.ceil
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» |
2
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(-1.2).ceil
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» |
-1
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(-2.0).ceil
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» |
-2
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finite?
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flt.finite? -> true or false
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Returns true if flt is a valid IEEE floating point
number (it is not infinite, and nan? is false).
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floor
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flt.floor -> anInteger
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Returns the largest integer less than or equal to flt.
1.2.floor
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» |
1
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2.0.floor
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» |
2
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(-1.2).floor
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» |
-2
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(-2.0).floor
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» |
-2
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infinite?
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flt.infinite? -> nil, -1,
+1
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Returns nil, -1, or +1 depending on whether flt is finite,
-infinity, or +infinity.
(0.0).infinite?
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» |
nil
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(-1.0/0.0).infinite?
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» |
-1
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(+1.0/0.0).infinite?
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» |
1
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nan?
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flt.nan? -> true or false
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Returns true if flt is an invalid IEEE
floating point number.
a = -1.0
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» |
-1.0
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a.nan?
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» |
false
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a = Math.log(a)
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» |
NaN
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a.nan?
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» |
true
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round
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flt.round -> anInteger
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Rounds flt to the nearest integer. Equivalent to:
def round
return floor(self+0.5) if self > 0.0
return ceil(self-0.5) if self < 0.0
return 0.0
end
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1.5.round
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» |
2
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(-1.5).round
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» |
-2
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to_f
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flt.to_f -> flt
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Returns flt.
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to_i
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flt.to_i -> anInteger
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Returns flt truncated to an Integer.
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to_s
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flt.to_s -> aString
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Returns a string containing a representation of self. As well as
a fixed or exponential form of the number, the call may return
``NaN'', ``Infinity'', and ``-Infinity''.
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