Haskell Program to print integer entered by the user

Program

prompt s = do
 putStrLn s
 number <- getLine
 return number
main = do
 number <- prompt "Enter a integer number"
 putStrLn ("Entered number: ")
 print $ (read number :: Int)

This Haskell program takes an integer input from the user and prints it to the console.

1. prompt Function

   • Takes a string s (prompt message).
   • Prints s using putStrLn.
   • Reads user input using getLine and returns it as a string.

2. main Function

   • Calls prompt with the message "Enter an integer number".
   • Stores the user input in number.
   • Prints "Entered number: ".
   • Converts number to an integer using read and prints it using print.

Key Takeaways

• getLine reads input as a string.
• read number :: Int converts the input string to an integer.
• print is used to output the integer.

Output

$ ghc read-int.hs 
[1 of 1] Compiling Main             ( read-int.hs, read-int.o )
Linking read-int ...
$ ./read-int 
Enter a integer number
6
Entered number: 
6