instansmetoder

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(self0.5) 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


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 ''.
