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Haskell Program to convert double type variables to string
In Haskell, we will convert double type variables into string by using user-defined function, doubleToString along with show function and Text.Printf and Data.Text module. In the first example, we are going to use ( let valueString = show input) and in the second example, we are going to use (doubleToString d = printf "%.2f" d). And in the third example, we are going to use (doubleToString d = unpack $ pack $ show d).
Step 1 − The program execution will be started from main function. The main() function has whole control of the program. It is written as main = do.
Step 2 − The variable named, “input” is being initialized. It will hold the double value that is to be converted to respective string value.
Step 3 − The show function is called with double value.
Step 4 − The resultant string value is printed to the console using ‘putStrLn’ statement.
In this method, the Double input is taken from the user, and show is used to convert that input to a String. The resulting String value is then printed using putStrLn.
main :: IO () main = do let input = 245.64 let valueString = show input putStrLn $ "The string value is: " ++ valueString
The string value is: 245.64
In this method, a function doubleToString is defined that uses the printf function to format the Double value as a string with two decimal places. We then use doubleToString to convert a Double value to a String and print it using putStrLn.
import Text.Printf (printf) doubleToString :: Double -> String doubleToString d = printf "%.2f" d main :: IO () main = do let value = 3.14159 :: Double putStrLn $ "The string value is: " ++ doubleToString value
The string value is: 3.14
In this method, the show function is used to convert the Double value to a String, and then use Data.Text.pack to convert the String to a Text value, and finally use Data.Text.unpack to convert the Text value back to a String.
import Data.Text (pack, unpack) doubleToString :: Double -> String doubleToString d = unpack $ pack $ show d main :: IO () main = do let value = 3.14159 :: Double putStrLn $ "The string value is: " ++ doubleToString value
The string value is: 3.14159
Double to string conversion is the process of converting a double precision floating-point value (also known as a double) to a string representation.In Haskell, you can use the show function to convert a Double value to a string. The show function takes a value of a specified type, such as Double, and returns a string representation of that value. The resulting string can then be printed, stored in a file, or sent over a network. Also, we can Data.Text and Text.Printf module for this conversion.
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