Following are the basic Numeric Types supported by Haskell. All these numeric types are instances of Num.
Type | Description |
Int | It is bounded Integer type, represent integer values, For 32-bit machines the range goes from -2147483648 to 2147483647. For 64-bit machine the range goes from -9223372036854775808 to 9223372036854775807 |
Integer | It is unbounded integer type, represent arbitrarily large integer values. Size is limited by the amount of memory available on your machine. |
Float | Single Precision Floating Point value. Used to Represent Real Numbers like 10.32, 9.86 etc., Usage of Float is discouraged, since Haskell compilers are written Double data type efficient code. |
Double | Double precision floating point value. Used to represent real numbers like 10.32, 9.86 etc., |
Following code snippet gives you the maximum and minimum values of Int type.
variable.hs
biggestInt, smallestInt :: Int
biggestInt = maxBound
smallestInt = minBound
Prelude> :load variable.hs
[1 of 1] Compiling Main ( variable.hs, interpreted )
Ok, modules loaded: Main.
*Main>
*Main> biggestInt
9223372036854775807
*Main>
*Main> smallestInt
-9223372036854775808
When a function signature supports a type T, then it can able to support all the child types of type T.
For example,
Prelude> :t (+)
(+) :: Num a => a -> a -> a
Operator + takes any variable of type Num, so it can support all sub types like Int, Integer, Float, Double.
Prelude> 10 + 90.09
100.09
Prelude> 10.01+100.98
110.99000000000001
Prelude> 10.01+987
997.01
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