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Haskell Program to convert int type variables to double
In Haskell, we will convert int type variables into double by using user-defined function, intToDouble along with fromIntegral, realToFrac and realPart functions. In the first example, we are going to use (intToDouble n = fromIntegral n) function and in the second example, we are going to use (intToDouble n = realToFrac n). And in the third example, we are going to use (intToDouble n = realPart (fromIntegral n :+ 0)).
Algorithm
Step 1 ? The intToDouble function is defined using fromIntegral function.
Step 2 ? 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 3 ? The variable named, "n" is being initialized. It will hold the integer that is to be converted to respective double value.
Step 4 ? The function, intToDouble is being called and n is passed to it.
Step 5 ? The resultant double value is printed to the console using ?putStrLn' statement after the function is called.
Example 1
In this example, the user-defined function, intToDouble is defined to convert the int variables to double using fromIntegral function.
intToDouble :: Int -> Double intToDouble n = fromIntegral n main :: IO () main = do let n = 42 putStrLn (show (intToDouble n))
Output
42.0
Example 2
In this example, the user-defined function, intToDouble is defined to convert the int variables to double using fromIntegral function by division.
intToDouble :: Int -> Double intToDouble n = fromIntegral n / 1.0 main :: IO () main = do let n = 42 putStrLn (show (intToDouble n))
Output
42.0
Example 3
In this example, the user-defined function, intToDouble is defined to convert the int variables to double using fromIntegral function by multiplication.
intToDouble :: Int -> Double intToDouble n = fromIntegral (n * 10^1) / 10.0 main :: IO () main = do let n = 42 putStrLn (show (intToDouble n))
Output
42.0
Example 4
In this example, the user-defined function, intToDouble is defined to convert the int variables to double using realToFrac function.
intToDouble :: Int -> Double intToDouble n = realToFrac n main :: IO () main = do let n = 42 putStrLn (show (intToDouble n))
Output
42.0
Example 5
In this example, the user-defined function, intToDouble is defined to convert the int variables to double using realPart function.
import Data.Complex intToDouble :: Int -> Double intToDouble n = realPart (fromIntegral n :+ 0) main :: IO () main = do let n = 42 putStrLn (show (intToDouble n))
Output
42.0
Conclusion
Integer to Double conversion is a process of converting an integer value to a floating-point value of type Double.In Haskell, an Int variable is converted to double using user-defined intToDouble function along with fromIntegral, realToFrac and realPart functions.
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