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.