Hello World

Hello world is a simple piece of code that simply displays the word "Hello world!". It is used as a basic check to see whether the program has been setup and installed correctly.

Python: Hello World
Python is an interpreted language, so there is no need to compile the code. It's hello world program is quite simple and only contains a single line of code using the  function.

This command fist creates a string comprising of the characters. Then the  command takes this string as input and displays it as a standard output of the program.

To run this code, in python, make sure Python is installed in your computer. Then you can either open the python command line using  command in your terminal and then simply type the code and press enter to see the output. Alternatively you can save the code in a file, say, then you can execute that file via terminal using the following command

R: Hello World
R is also an interpreted language and its hello world program is very similar to python and thus uses just a single  function.

In R, every variable is a vector, hence "Hello World!" creates a one dimensional character vector. The print command displays this in the standard output. Since this is a character vector, we see a  index written before the output indicating the first character.

To run this code, in R, make sure R is installed in your computer. Then you can either open the python command line using  command in your terminal and then simply type the code and press enter to see the output.

Rust: Hello World
Rust is a compiled language and its hello world program can be written as follows. The  function is the entry point of the Rust program, where the execution of the program begins.

The  macro then prints the text "Hello, World!" to the console. The exclamation mark (!) indicates that this is a macro rather than a regular function call.