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:

How to Get the Current Directory in 10 Different Programming Languages

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")
}