Number rounding

As explained in Learn Haskell by Example

round is a Haskell function that converts a fractional value to the nearest integral value according to its rounding rules.

How Learn Haskell by Example covers it

How deep it goes

Defines the RealFrac-to-Integral type relationship and demonstrates round in sample-count helpers and GHCi.

Examples

Uses audio sample-rate helpers and round (3.1415 :: Double) :: Integer as concrete examples.

What it assumes

Assumes basic arithmetic and introduces RealFrac and Integral as the relevant numeric type classes.

What you can do after

Apply round to convert floating-point calculations into values with an Integral result type.

How it connects

Connects RealFrac, Integral, Fractional, floating-point values, integer values, and sample rate calculations.

liveBookmanning.com

Read Learn Haskell by Example on liveBook Get the book at manning.com

Also explained in

• 

  liveBookmanning.com
  Math for Web DesignA rounding strategy specifies how a numerical value is selected when rounding it to an interval.
• 

  liveBookmanning.com
  Get Programming: Learn to code with PythonA Python built-in function that returns a number rounded to a specified precision or to the nearest whole-number value by default.
• 

  liveBookmanning.com
  Clojure: The Essential ReferenceNumeric rounding is the approximation of a value to the finite precision available in its numerical representation.

Compare how 4 books explain number rounding →

Related concepts

• integerproduces · An integer is a whole number with no fractional part, including negative numbers, zero, and positive numbers.
• RealFracuses · RealFrac is the Haskell type class for fractional real-number types that support conversion to integral values and decomposition into integral and fractional parts.
• floating-point arithmeticaddresses · Floating-point arithmetic is computation using finite-precision representations of real numbers, in which rounding and limited range can make results differ from exact real-number arithmetic.
• functionkind of · A function is a defined operation that maps inputs to outputs and, when implemented as a callable program unit, may also produce effects.

This explainer was generated by Manning's knowledge graph from the text of Learn Haskell by Example. The section links point to the parts of the book it draws on.