How to “Hellow World” in different programming languages

5 min readMay 23, 2022

Sometimes we want to start writing in a different programming language (just to know). So here I'll present to you how to do it!!

Programming Languages Table

Here is a little information about programming languages.

Bash

The name is Bourne-again shell, created by Brian Fox.

The Hello World in Bash:

#!/usr/bin/env bash

#source "";

main() {
  printf "\n\tHola Mundo Bash !!\n\n";
  printf "Numero de argumentos: %i\n" "$(($#+1))";
  for((c=0; c<=("$#"); c++)); do  
    printf "Argumento[$c] = ${!c} \n";
  done
  return ;
}

main $@;

How to run the file:

bash helloWorld.sh

C

This is the core of all applications, created by Dennis M. Ritchie.

To install:

sudo apt-get install build-essentials

The Hello World in C:

#include <stdio.h>

int main(int argc,char* argv[]){
  int i;
  printf("\n\tHola Mundo C !!\n\n");
  printf("Numero de argumentos: %i\n",argc);
  for(i=0;i<argc;i++){
    printf("Argumento[%i] = %s\n",i,argv[i]);
  }
  return 0;
}

How to compile & run the file:

gcc helloWorld.c -o helloWorld && ./helloWorld

Converting to assembly

Preprocessing (EXPAND MACROS):

cpp archivo.c > archivo.i

The compilation (FROM SOURCE CODE TO ASSEMBLY):

gcc -Wall -S hello.i

Assembly (FROM ASSEMBLY LANGUAGE TO MACHINE CODE):

as hello.s -o hello.o

Linking (CREATE THE FINAL EXECUTABLE):

gcc hello.o

CPP (C++)

This is the core of all applications, created by Bjarne Stroustrup.

To install:

sudo apt-get install build-essentials

The Hello World in C++:

#include <iostream>

using namespace std;

int main(int argc,char* argv[]){
  int i;
  cout<<endl<<"\tHola Mundo C++ !!"<<endl<<endl;
  cout<<"Numero de argumentos: "<<argc<<endl;
  for(i=0;i<argc;i++){
    cout<<"Argumento["<<i<<"] = "<<argv[i]<<endl;
  }
  return 0;
}

How to compile & run the file:

g++ helloWorld.c++ -o helloWorld && ./helloWorld

CS (C#)

Created by Anders Hejlsberg.

To install:

sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EFecho "deb https://download.mono-project.com/repo/ubuntu stable-bionic main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.listsudo apt install mono-devel

The Hello World in C#:

using System;

namespace HelloWorld{
  public class mainClass{
    public static void Main(string[] args){
      int argc = args.Length;
      string currentFile = new System.Diagnostics.StackTrace(true).GetFrame(0).GetFileName();
      System.Console.WriteLine("\n\tHola Mundo C# !!\n");
      System.Console.WriteLine("Numero de argumentos: {0}", argc+1);
      System.Console.WriteLine("Argumento[0] = {0}", currentFile);
      for (int i = 0; i < argc; i++){
        System.Console.WriteLine("Argumento[{0}] = {1}", i+1, args[i]);
      }
    }
  }
}

How to compile & run the file:

mcs helloWorld.cs -out:helloWorld && ./helloWorld

Golang (Go)

This is the new core for many applications, created by Robert Pike.

To install:

To install go latest:

wget https://storage.googleapis.com/golang/go1.9.1.linux-amd64.tar.gz

Unzip in /usr/local directory:

sudo tar -C /usr/local -xzf go1.9.1.linux-amd64.tar.gz
tar -C ./ -xzf go1.9.1.linux-amd64.tar.gz

Then, modify /etc/profile file, add this line:

export PATH=$PATH:/usr/local/go/bin

Also, add these lines in /home/$USER/.profile file:

export GOPATH=$HOME/golangProjects
export GOROOT=$HOME/go
export PATH=$PATH:$GOROOT/bin

Finally, reboot or execute this:

source .profile
sudo source /etc/profile

The Hello World in Golang:

package main

import (
  "os";
  "fmt";
)

func main() {
  fmt.Printf("\n\tHola Mundo Go !!\n\n");
  fmt.Printf("Numero de argumentos: %d\n", len(os.Args));
  for i,e := range os.Args {
    fmt.Printf("Argumento[%d] = %s\n", i, e);
  }
  return ;
}

How to compile & run the file:

go build -o helloWorld helloWorld.go && ./helloWorld

Java

Its a one important programming language in software development, created by James A. Gosling.

To install:

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer
sudo apt-get install oracle-java8-set-default

The Hello World in Java:

class HelloWorld {
  public static void main(String[] args) {
    int argc = args.length;
    System.out.println("\n\tHola Mundo Java !!\n");
    System.out.printf("Numero de argumentos: %d\n", argc+1);
    System.out.printf("Argumento[0] = %s\n", "nombre del archivo");
    for(int i =0; i<argc; i++) {
      System.out.printf("Argumento[%d] = %s\n", i+1, args[i]);
    }
  }
}

To run the file:

javac helloWorld.java
java HelloWorld

JavaScript (JS)

Another important programming language was created by Brendan Eich.

To install (also, you can run it in a web browser):

curl -sL https://deb.nodesource.com/setup_6.x -o nodesource_setup.shnano nodesource_setup.shsudo bash nodesource_setup.shsudo apt-get install nodejs npmnpm install [package]

The Hello World program:

#!/usr/bin/env nodejs

var path = require('path');

function main(argv){
  var argc = argv.length;
  console.log('\n\tHola Mundo Javascript !!\n');
  console.log(`Numero de argumentos: ${(argv.length-1)}`);
  console.log('Argumento[0] = ' + path.basename(argv[1]))
  for (i=2; i< argc; i++){
    console.log(`Argumento[${i-1}] = ${argv[i]}`);
  }
  return;
}

main(process.argv)

To run the file:

nodejs helloWorld.js

M (Octave/MATLAB)

An important programming language for many applications in numeric fields, created by Jhon W. Eaton.

To install:

sudo apt-get install octave liboctave-dev

The Hello World in Octave:

#!/usr/bin/env octave

#pkg install control-1.0.0.tar.gz
#pkg install control
#pkg load control
#addpath(genpath('./../locallib'));

a=3;

function []=main(argcs,argvs)
  printf("\n\tHola Mundo M !!\n\n");
  printf("Numero de argumentos: %i\n",argcs+1);
  printf("Argumento[0] = %s\n",program_name());
  for i = 1:argcs
    printf("Argumento[%i] = %s\n",i,argvs{i});
  end
  return;
end

main(nargin(),argv())

To run the file:

octave helloWorld.m

Perl (PL)

Important language to develop HTTP servers, created by Larry Wall.

To install:

sudo apt-get install perl

The Hello World in Perl:

#!/usr/bin/env perl

use strict;
use warnings;

sub main{
  my @argv = @_;
  my $argc = (@argv);
  print("\n\tHola Mundo Perl !!\n\n");
  print("Numero de argumentos: ".($argc+1)."\n");
  print("Argumento[0] = $0\n");
  foreach my $i(0..($argc-1)){
    print("Argumento[".($i+1)."] = $argv[$i]\n");
  }
  return;
}

main(@ARGV);

To run the file:

perl helloWorld.pl

PHP

Important language to develop web servers, created by Rasmus Lerdorf.

To install:

sudo apt-get install php7.0 composer
composer install [package]

The Hello World in PHP:

#!/usr/bin/env php

<?php
class HelloWorld{
  public static function main($arguments, $count){
    print("\tHola Mundo PHP !!\n\n");
    print("Numero de argumentos: $count\n");
    foreach($arguments as $key => $value){
      print("Argumento[$key] = $value\n");
    }
    return;
  }
}
HelloWorld::main($argv, $argc);
?>

To run the file:

php helloWorld.php

Python

A very important programming language, created by Guido van Rossum.

To install:

sudo apt-get install python python-pip
pip install [package]

The Hello World in Python:

#!/usr/bin/env python

# -*- coding: utf-8 -*-
  
#from locallib import *
import sys

def main(argv):
  print("\n\tHola Mundo Python !!\n");
  argc = len(sys.argv);
  print("Numero de argumentos: %i" %(argc));
  for i in range(argc):
    print("Argumento[%i] = %s" %(i,sys.argv[i]));
  return;

if __name__ == "__main__":
  main(sys.argv[1:]);

To run the file:

python helloWorld.py

R

An important statistic language, created by Robert C. Gentleman.

To install:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E298A3A825C0D65DFD57CBB651716619E084DAB9sudo add-apt-repository 'deb https://cloud.r-project.org/bin/linux/ubuntu bionic-cran35/'sudo apt-get updatesudo apt-get install r-base r-base-dev

The Hello World in R:

#!/usr/bin/env Rscript

#library(stats);

printf <- function(...){ invisible(cat(sprintf(...)))}

main<-function(argsv){
  printf("\n\tHola Mundo R !!\n\n");
  argc<-length(argsv);
  argsv[4] = strsplit(argsv[4],"--file=")[[1]][2]
  if(argc>5){ printf("Numero de argumentos: %d\n",argc-4);}
  else{ printf("Numero de argumentos:",argc-3,"\n");}
  printf("Argumento[0] = %s\n",argsv[4]);
  if(argc>5){
    for(i in 6:argc){
      printf("Argumento[%d] = %s \n",i-5, argsv[i])
    }
  }
  return ();
}

mainf<-main(commandArgs(trailingOnly = FALSE));

To run the file:

Rscript helloWorld.R

Ruby

Important to develop services, created by Yukihiro “Matz” Matsumoto.

To install:

sudo apt-get install ruby-full ruby-dev ruby gemgem install [package]

The Hello World in Ruby:

#!/usr/bin/env ruby

#require 'io/console';

def main(argv)
  argc = argv.length;
  print("\n\tHola Mundo Ruby !!\n\n");
  print("Numero de argumentos: #{argc+1}\n");
  print("Argumento[0] = #{File.basename(__FILE__)}\n");
  for i in 0...argc
    print("Argumento[#{i+1}] = #{argv[i]}\n");
  end
  return;
end

main ARGV;