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    How to Check File Size in 10 Programming Languages

    C, C++, Java, Lua, Perl, Python, PHP, C#, JavaScript/Nodejs and Go.

    How to Check File Size in 10 Programming Languages

    Today, once again, we are going to exercise our knowledge by creating routines that can be useful in different situations. And this time we will see how to know the size of a file in 10 different programming languages, they are: C, C++, Java, C#, [PHP] (https://terminalroot.com/tags#php), Lua, Perl, Python, JavaScript/Node.js and Go/Golang.

    As in the article:

    I’ll just post the code for each of them!

    The file.iso file is fictitious and you must replace it with a valid file on your computer to carry out the tests.

    You can compare the result using the command: du -h file.iso.

    01. C

    filesize.c

    #include <stdio.h>

int main(){
  FILE * file = fopen("file.iso", "rb");
  fseek(file, 0, SEEK_END);
  int size = ftell(file);
  fclose(file);
  printf("%d MB\n", (size / 1024) / 1024);
  return 0;
}

    gcc filesize.c && ./a.out

    02. C++

    filesize.cpp

    #include <iostream>
#include <fstream>

int main(){
  std::ifstream file("file.iso", std::ios::in | std::ios::binary);
  file.seekg(0, std::ios::end);
  std::cout << (file.tellg() / 1024) / 1024 << " MB\n";
  return 0;
}

    g++ filesize.cpp && ./a.out

    03. Java

    FileSize.java

    import java.io.File;

public class FileSize {
  public static void main(String[] args) {
    String path = "file.iso";
    long size = new File(path).length();
    System.out.println(( size / 1024 ) / 1024 + " MB");
  }
}

    javac FileSize.java && java FileSize

    04. Lua

    filesize.lua

    file = io.open("file.iso", "r")
size = math.floor((file:seek("end") / 1024) / 1024)
print(size .. " MB")

    lua filesize.lua

    05. Perl

    filesize.pl

    $path = "file.iso";
my $x = -s $path;
$x = ($x / 1024) / 1024;
$x = int($x);
print("$x MiB\n");

    perl filesize.pl

    06. Python

    filesize.py

    import os
path = "file.iso"
size = os.path.getsize(path)
print( str( int( (size / 1024) / 1024) ) + " MB")

    python filesize.py

    07. PHP

    filesize.php

    <?php
$path = "file.iso";
$x = filesize($path) / 1024 / 1024; 
echo intval($x) . " MB\n";

    php filesize.php

    08. C#

    dotnet new console -o FileSize && cd FileSize && vim Program.cs

    string path = "file.iso";
long size = new System.IO.FileInfo(path).Length;
Console.WriteLine( (size/1024) / 1024 + " MB" );

    dotnet run

    09. JavaScript/Node.js

    filesize.js

    const {readFileSync: read} = require ('fs')
const path = "file.iso"
let size = read(path).length
size = (size / 1024) / 1024
console.log(parseInt(size) + " MB")

    node filesize.js

    10. Golang/Go

    filesize.go

    package main

import("fmt";"os")

func main(){
  file, err := os.Stat("file.iso")
  _ = err
  size := file.Size()
  fmt.Println( (size/1024) / 1024,"MB")
}

    go build filesize.go && ./filesize ou go run filesize.go

    Until the next article!

    clanguage cpp java lua perl python php csharp javascript nodejs go programming langs

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