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 <table> <td>Returns the largest integer less than or equal to n.</td> </table> 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.