Today, I wrote my first "Hello World" code in C++. This seems to be the first code every developer writes.
Before writing the code, there is a prerequisite. As you see, every code needs to be translated into machine code for computers to understand. The C++ code also needs to be translated into machine code. Compilers do the translating for us.
C++ requires a compiler named GNU compiler collection ... GCC in short. This compiler seems like a common compiler for many programming languages. I had to install it before compiling my Hello_world.cpp file. All the installation and code compilation was done from terminal and the code was written in nano text editor. I performed all the tasks in Ubuntu 20.04.
All the steps to write the Hello World code is as follows:
Step 1:
Fire up a terminal by pressing ctrl+alt+T and install G++ (Linux OS) by typing
$sudo apt install g++
Do not forget to type your password. You will be seeing a bunch of lines running down after that.
Step 2:
Confirm if g++ is installed or not by typing
$g++ --version
You will see an output like this.
g++ (Ubuntu 9.3.0-10ubuntu2) 9.3.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Step 3
Create a new directory in your preferred location and change directory to the one you created. You might have to use sudo to create a directory.
$sudo mkdir hello_world
$cd hello_world
Step 4
Create a text file
$touch hello_world.cpp
Step 5
Edit the file using nano editor. In other words, type nano with the cpp file.
$sudo nano hello_world.cpp
A command-line editor will open. Here you will have to writer your code.
Step 6
Now the moment of truth! You write your first hello world code.
#include <iostream>
using namespace std;
int main(){
cout<<"Hello World!" <<endl;
return 0;
}
Step 7
Create a binary file.
$g++ hello_world.cpp -o hello_world
Step 8
Now run the binary file.
$./hello_world
This command will print a string in the terminal.
Hello World!
And Wala! You have your first code written in C++.
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