Ruby Programming/Reference/Objects/Numeric

Numeric provides common behavior of numbers. Numeric is an abstract class, so it should not be instantiated.
Included Modules:

Comparable

Instance Methods:
+ n

    Returns n.

- n

    Returns n negated.

n + num
n - num
n * num
n / num

    Performs arithmetic operations: addition, subtraction, multiplication, and division.

n % num

    Returns the modulus of n.

n ** num

    Exponentiation.

n.abs

    Returns the absolute value of n.

n.ceil

    Returns the smallest integer greater than or equal to n.

n.coerce( num)

Returns an array containing num and n both possibly converted to a type that allows them to be operated on mutually. Used in automatic type conversion in numeric operators.

n.divmod( num)

    Returns an array containing the quotient and modulus from dividing n by num.

n.floor

Returns the largest integer less than or equal to n.

    1.2.floor            #=> 1
    2.1.floor            #=> 2
    (-1.2).floor         #=> -2
    (-2.1).floor         #=> -3

n.integer?

    Returns true if n is an integer.

n.modulo( num)

    Returns the modulus obtained by dividing n by num and rounding the quotient with floor. Equivalent to n.divmod(num)[1].

n.nonzero?

    Returns n if it isn't zero, otherwise nil.

n.remainder( num)

Returns the remainder obtained by dividing n by num and removing decimals from the quotient. The result and n always have same sign.

    (13.modulo(4))         #=>  1
    (13.modulo(-4))        #=> -3
    ((-13).modulo(4))      #=>  3
    ((-13).modulo(-4))     #=> -1
    (13.remainder(4))      #=>  1
    (13.remainder(-4))     #=>  1
    ((-13).remainder(4))   #=> -1
    (-13).remainder(-4))   #=> -1

n.round

   Returns n rounded to the nearest integer.

    1.2.round              #=> 1
    2.5.round              #=> 3
    (-1.2).round           #=> -1
    (-2.5).round           #=> -3

n.truncate

   Returns n as an integer with decimals removed.

    1.2.truncate           #=> 1
    2.1.truncate           #=> 2
    (-1.2).truncate        #=> -1
    (-2.1).truncate        #=> -2

n.zero?

    Returns zero if n is 0.