Step by Step solution about How to resolve the algorithm A+B step by step in the Haskell programming language

This is a simple Haskell program that takes a line of input from the standard input, parses the line into a list of integers using the words function, converts each integer string into an integer using the read function, and then sums the list of integers using the sum function. The result of the sum is then printed to the standard output using the print function.

Here is a breakdown of the code:

• getLine: Reads a line of text from the standard input.
• words: Splits the line of text into a list of words.
• map read: Converts each word in the list of words into an integer.
• sum: Sums the list of integers.
• print: Prints the result of the sum to the standard output.

The =<< operator is used to thread the result of one function call into the next function call. In this case, the result of the getLine function call is threaded into the words function call, and the result of the words function call is threaded into the map read function call, and so on.

The overall effect of the program is to read a line of input from the standard input, parse the line into a list of integers, sum the list of integers, and then print the result to the standard output.

main =  print . sum . map read . words =<< getLine