Ruby String To Integer Or Float

The string objects in ruby have several methods to convert the string object into a number.

Ruby string to integer or float. It turns out that it s not entirely that simple to answer and there are lot of apparently correct ideas that all turn out to fail closer scrutiny. In this tutorial you ll convert strings to numbers objects to strings strings to arrays and convert between strings and symbols. Returns the smallest number greater than or equal to int with a precision of ndigits decimal digits default. The smallest positive normalized number in a double precision floating point.

To f will convert the string to an float a floating pont. In ruby float class is a subclass of numeric class. To r will convert the string to a rational number. 0 0 next float returns the smallest positive floating point number including denormalized numbers.

The objects of the float class represents real numbers using the native architecture s double precision floating point representation. Usually defaults to 2 2250738585072014e 308. If you re converting strings to numbers and need error checking consider using float str or integer str. To i converts a string to an integer and to f converts a string to a float.

Posted 14 april 2011 in programming finally a technical article this one caused by a seemingly simple question on stack overflow asking how to test if string is a number. Integer ruby 2 5 0. To i will convert the string to an integer. If the platform supports denormalized numbers there are numbers between zero and float min.

Example 123 50 to f 123 5 float 123 50 123 5 however there is a difference when the string is not a valid float. Converting strings to numbers ruby provides the to i and to f methods to convert strings to numbers. How to check if a string is numeric. String click to toggle source.

To c will convert the string to a complex number. Let s start by taking a look at the class hierarchy of all the number related classes in ruby. Numeric integer fixnum bignum float complex rational bigdecimal standard library as you can see the numeric class is the parent for all the number classes. Ceil ndigits integer or float click to toggle source.

Casting to a float.