Both the operators ^, ** are used to calculate the power of a variable, only difference is ‘^’ can only raise a number to an integer power, where as ** use a floating-point number as the exponent.
*Main> 9 ^ 3
729
*Main> 9 ** 3.0
729.0
*Main>
*Main> 9 ** 3.2345
1220.3865055644424
*Main>
Haskell throws an error, when you try to use ^ with floating point exponent.
*Main> 9 ^ 3.2345
<interactive>:67:3:
Could not deduce (Integral b0) arising from a use of ‘^’
from the context (Num a)
bound by the inferred type of it :: Num a => a
at <interactive>:67:1-10
The type variable ‘b0’ is ambiguous
Note: there are several potential instances:
instance Integral Integer -- Defined in ‘GHC.Real’
instance Integral Int -- Defined in ‘GHC.Real’
instance Integral Word -- Defined in ‘GHC.Real’
In the expression: 9 ^ 3.2345
In an equation for ‘it’: it = 9 ^ 3.2345
<interactive>:67:5:
Could not deduce (Fractional b0) arising from the literal ‘3.2345’
from the context (Num a)
bound by the inferred type of it :: Num a => a
at <interactive>:67:1-10
The type variable ‘b0’ is ambiguous
Note: there are several potential instances:
instance Integral a => Fractional (GHC.Real.Ratio a)
-- Defined in ‘GHC.Real’
instance Fractional Double -- Defined in ‘GHC.Float’
instance Fractional Float -- Defined in ‘GHC.Float’
In the second argument of ‘(^)’, namely ‘3.2345’
In the expression: 9 ^ 3.2345
In an equation for ‘it’: it = 9 ^ 3.2345
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