How to resolve the algorithm File input/output step by step in the Racket programming language

Published on 12 May 2024 09:40 PM
#Racket

How to resolve the algorithm File input/output step by step in the Racket programming language

Table of Contents

Problem Statement

Create a file called   "output.txt",   and place in it the contents of the file   "input.txt",   via an intermediate variable. In other words, your program will demonstrate:

Oneliners that skip the intermediate variable are of secondary interest — operating systems have copy commands for that.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm File input/output step by step in the Racket programming language

Source code in the racket programming language

#lang racket
(define file-content
  (with-input-from-file "input.txt"
    (lambda ()
      (let loop ((lst null))
        (define new (read-char))
        (if (eof-object? new)
            (apply string lst)
            (loop (append lst (list new))))))))

(with-output-to-file "output.txt"
  (lambda ()
    (write file-content)))

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