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Haskell Program to calculate the value from the given fraction and exponent
This haskell tutorial will help us in calculating the value from the given fraction and exponent of a number. To find this, the input is taken as fraction and exponent, and its corresponding value is computed.
Algorithm
Step 1 − The “Data.Ratio” is imported to work over fractions.
Step 2 − The calculateValue function is defined
Step 3 − Program execution will be started from main function. The main() function has whole control of the program. It is written as main = do.
Step 4 − The variables named, “fraction” and “exponent” are initialized. It will hold the fraction and exponent whose value is to be computed.
Step 5 − The result is printed to the console using ‘putStrLn’ statement under case.
Example 1
In this example, we are going to see that how we can calculate the value from the given fraction and exponent using fromRational function.
import Data.Ratio
calculateValue :: Rational -> Integer -> Double
calculateValue fraction exponent = (fromRational fraction)^exponent
main :: IO ()
main = do
let fraction = 3 % 4
let exponent = 2
let value = calculateValue fraction exponent
putStrLn ("The value is: " ++ show value)
Output
The value is: 0.5625
Example 2
In this example, we are going to see that how we can calculate the value from the given fraction and exponent using Maybe monad.
import Data.Ratio
calculateValue :: Rational -> Integer -> Maybe Double
calculateValue fraction exponent = (^ exponent) <$> (Just $ fromRational fraction)
main :: IO ()
main = do
let fraction = 3 % 4
let exponent = 2
let result = calculateValue fraction exponent
case result of
Just value -> putStrLn ("The value is: " ++ show value)
Nothing -> putStrLn "An error occured"
Output
The value is: 0.5625
Example 3
In this example, we are going to see that how we can calculate the value from the given fraction and exponent using Either monad.
import Data.Ratio
calculateValue :: Rational -> Integer -> Double
calculateValue fraction exponent = (fromRational fraction)^exponent
main :: IO ()
main = do
let fraction = 3 % 4
let exponent = 2
let result = Right (calculateValue fraction exponent)
case result of
Right value -> putStrLn ("The value is: " ++ show value)
Left error -> putStrLn error
Output
The value is: 0.5625
Conclusion
The value from the given fraction and exponent in Haskell, can be calculated by using the fromRational function, by using Maybe or Either monad.
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