Ruby 1.9.2 Reference Manual > All Libraries > Builtin Library > class Rational > numerator

instance method Rational#numerator

numerator -> Integer

分子を返します。

[RETURN]

分子を返します。

例:

Rational(7).numerator       # => 7
Rational(7, 1).numerator    # => 7
Rational(9, -4).numerator   # => -9
Rational(-2, -10).numerator # => 1

[SEE_ALSO] Rational#denominator