float « Number « Ruby

1.Floating Point Numbers
2.Check whether a number is finite or infinite with the finite? and infinite?
3.Check whether a floating-point value is a number at all with Float's nan?
4.ArgumentError: invalid value for Float(): "99.44% pure"
5.Float value step
6.Float predicates
7.Class constants
8.Rounding methods
9.Absolute value and sign

10.Constants in Float
11.Round a float
12.round Rounds to the nearest integer.