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Rational#round(precision = 0) -> Integer | Rational (117970.0)

...//emlist[例][ruby]{
Rational
(3).round # => 3
Rational
(2, 3).round # => 1
Rational
(-3, 2).round # => -2
//}

precision を指定した場合は指定した桁数の数値と、上述の性質に最も近い整

//emlist[例][ruby]{
Rational
('-123.456').round(+...
...1) # => (-247/2)
Rational
('-123.456').round(+1).to_f # => -123.5
Rational
('-123.456').round(0) # => -123
Rational
('-123.456').round(-1) # => -120
Rational
('-123.456').round(-2) # => -100
//}

@see Rational#ceil, Rational#floor, Rational#truncate...

Rational#floor(precision = 0) -> Integer | Rational (63613.0)

...[ruby]{
Rational
(3).floor # => 3
Rational
(2, 3).floor # => 0
Rational
(-3, 2).floor # => -2
//}

Rational
#to_i とは違う結果を返す事に注意してください。

//emlist[例][ruby]{
Rational
(+7, 4).to_i # => 1
Rational
(+7, 4).floor # => 1
Rational
(-7, 4).to_i # => -1
Rational
(-7, 4...
... Rational を返します。

//emlist[例][ruby]{
Rational
('-123.456').floor(+1) # => (-247/2)
Rational
('-123.456').floor(+1).to_f # => -123.5
Rational
('-123.456').floor(0) # => -124
Rational
('-123.456').floor(-1) # => -130
//}

@see Rational#ceil, Rational#round, Rational#tr...

Rational#ceil(precision = 0) -> Integer | Rational (63523.0)

...//emlist[例][ruby]{
Rational
(3).ceil # => 3
Rational
(2, 3).ceil # => 1
Rational
(-3, 2).ceil # => -1
//}

precision を指定した場合は指定した桁数の数値と、上述の性質に最も近い整

//emlist[例][ruby]{
Rational
('-123.456').ceil(+1...
...) # => (-617/5)
Rational
('-123.456').ceil(+1).to_f # => -123.4
Rational
('-123.456').ceil(0) # => -123
Rational
('-123.456').ceil(-1) # => -120
//}

@see Rational#floor, Rational#round, Rational#truncate...