File input/output

In this task, the job is to create a file called "output.txt", and place in it the contents of the file "input.txt".

C

Compiler: GCC 4.1.2

#include <stdio.h>

int main(int argc, char **argv) {
  FILE *in, *out;
  int c;

  in = fopen("input.txt", "r");
  if (!in) {
    fprintf(stderr, "Error opening input.txt for reading.\n");
    return 1;
  }

  out = fopen("output.txt", "w");
  if (!out) {
    fprintf(stderr, "Error opening output.txt for writing.\n");
    return 1;
  }

  while ((c = fgetc(in)) != EOF) {
    fputc(c, out);
  }

  return 0;
}

C#

Platform: .NET Language Version: 1.0+

   using System;
   using System.IO;
 
   namespace FileIO
   {
       class Program
       {
           static void Main(string[] args)
           {
               if (File.Exists("input.txt"))
               {
                   TextReader tr = File.OpenText("input.txt");
                   TextWriter tw = new StreamWriter(File.OpenWrite("output.txt"));

                   while (tr.Peek() != -1)
                   {
                       string line = tr.ReadLine();

                       tw.WriteLine(line);
                   }

                   tw.Close();
                   tr.Close();
               }
               else
               {
                   Console.WriteLine("Input File Missing.");
               }
           }
       }
   }

Perl

Interpreter: Perl 5.8.8

#!/usr/bin/perl -w

open INPUT, "<input.txt";
open OUTPUT, ">output.txt";

while ( <INPUT> ) {
  print OUTPUT $_;
}

mIRC

Compiler: mIRC

 alias Write2FileAndReadIt {
 .write myfilename.txt Goodbye Mike!
 .echo -a Myfilename.txt contains: $read(myfilename.txt,1)
 }

Python

Interpreter: Python 2.4

In short form:

 open("output.txt", "w").writelines(open("input.txt"))

With proper closing and exception-handling:

inputFile = open("input.txt","r")
try:
  outputFile = open("output.txt", "w")
  try:
    outputFile.writelines(inputFile)
  finally:
    inputFile.close()
finally:
  outputFile.close()

TCL

Interpreter: tclsh, eTcl, wish, tixwish

set in [open "input.txt" r]
set out [open "output.txt" w]
puts -nonewline $out [read $in]
close $in
close $out

Other File I/O:

#open file for writing
set myfile [open "README.TXT" w]
#write something to the file
puts $myfile "This is line 1, so hello world...."
#close the file
close $myfile

#open file for reading
set myfile [open "README.TXT" r]
#read something from the file
gets $myfile mydata
#show what was read from the file
#should print "This is line1, so hello world...."
puts $mydata
#close the file
close $myfile

UNIX Shell

Interpreter: Bourne Shell Operating System: UNIX

#!/bin/sh

while read a; do
    echo "$a"
done <input.txt >output.txt