File input/output: Difference between revisions
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==[[C++]]== |
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'''Interpreter:''' [[GCC]] 3.4.2 |
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#include <iostream> |
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#include <fstream> |
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#include <string> |
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using namespace std; |
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int main() { |
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string line; |
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ifstream input ( "input.txt" ); |
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ofstream output ("output.txt"); |
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if (output.is_open()) { |
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if (input.is_open()) { |
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while (! input.eof() ) { |
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getline (input,line); |
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output << line << endl; |
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} |
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input.close(); |
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} |
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else { |
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cout << "input.txt cannot be opened!\n"; |
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} |
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output.close(); |
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} |
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else { |
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cout << "output.txt cannot be written to!\n"; |
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} |
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return 0; |
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} |
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==[[Perl]]== |
==[[Perl]]== |
Revision as of 17:58, 21 January 2007
File input/output
You are encouraged to solve this task according to the task description, using any language you may know.
You are encouraged to solve this task according to the task description, using any language you may know.
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."); } } } }
C++
Interpreter: GCC 3.4.2
#include <iostream> #include <fstream> #include <string> using namespace std;
int main() { string line; ifstream input ( "input.txt" ); ofstream output ("output.txt"); if (output.is_open()) { if (input.is_open()) { while (! input.eof() ) { getline (input,line); output << line << endl; } input.close(); } else { cout << "input.txt cannot be opened!\n"; } output.close(); } else { cout << "output.txt cannot be written to!\n"; } return 0; }
Perl
Interpreter: Perl 5.8.8
#!/usr/bin/perl -w open INPUT, "<input.txt"; open OUTPUT, ">output.txt"; while ( <INPUT> ) { print OUTPUT $_; }
PHP
Interpreter: PHP 4
<?php if (!$in=fopen('input.txt','r')) { die('Could not open input.txt!'); } if (!$out=fopen('output.txt','w')) { die('Could not open output.txt!'); } while(!feof($in)) { $data = fread($in,512); fwrite($out,$data); } fclose($out); fclose($in); ?>
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