instance methods
|
Arithmetic operations |
|
|
Performs various arithmetic operations on flt.
flt |
+ |
aNumeric |
Addition |
flt |
-- |
aNumeric |
Subtraction |
flt |
* |
aNumeric |
Multiplication |
flt |
/ |
aNumeric |
Division |
flt |
% |
aNumeric |
Modulo |
flt |
** |
aNumeric |
Exponentiation |
| <=> |
flt <=> aNumeric
-> -1, 0, +1
|
|
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 .
| ceil |
flt.ceil -> anInteger
|
|
Returns the smallest Integer greater than or equal to flt.
1.2.ceil |
» |
2 |
2.0.ceil |
» |
2 |
(-1.2).ceil |
» |
-1 |
(-2.0).ceil |
» |
-2 |
| finite? |
flt.finite? -> true or false
|
|
Returns true if flt is a valid IEEE floating point
number (it is not infinite, and nan? is false ).
| floor |
flt.floor -> anInteger
|
|
Returns the largest integer less than or equal to flt.
1.2.floor |
» |
1 |
2.0.floor |
» |
2 |
(-1.2).floor |
» |
-2 |
(-2.0).floor |
» |
-2 |
| infinite? |
flt.infinite? -> nil , -1,
+1
|
|
Returns nil , -1, or +1 depending on whether flt is finite,
-infinity, or +infinity.
(0.0).infinite? |
» |
nil |
(-1.0/0.0).infinite? |
» |
-1 |
(+1.0/0.0).infinite? |
» |
1 |
| nan? |
flt.nan? -> true or false
|
|
Returns true if flt is an invalid IEEE
floating point number.
a = -1.0 |
» |
-1.0 |
a.nan? |
» |
false |
a = Math.log(a) |
» |
NaN |
a.nan? |
» |
true |
| round |
flt.round -> anInteger
|
|
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
|
1.5.round |
» |
2 |
(-1.5).round |
» |
-2 |
| to_f |
flt.to_f -> flt
|
|
Returns flt.
| to_i |
flt.to_i -> anInteger
|
|
Returns flt truncated to an Integer .
| to_s |
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 ''.
|