Introduction

If you are a learner and you are thinking about starting to learn any programming language, then solving problems with the language along with learning the fundamentals is a must thing do.

In that aspect, all of us start learning any programming language by printing something in the console/terminal, to be more specific, we start with writing Hello World!. As I am trying to make the series Solve Problems Using C++ a successful series, I am also starting this series with Hello World. 😊

General Code Without using namespace std

#include <iostream> // iostream = input output stream

int main()
{
    std:: cout << "Hello World"; // cout = console out / console output
    return 0;
}

Firstly, we need to use the header, and I am using the common iostream header file. iostream is basically the abbreviation or the short form for Input-Output stream. As we are printing something in the console/terminal, we are using the standard input/output (cout/cin) here. Therefore, we are using this header file for now.

Each C++ program execution process starts from the main() function. Then in the main() function, we are adding our block of code. Here, as I simply want to print something in the console, I am using cout, and it is the short form for console out/console output. I am using the standard output form, and therefore using the std:: to specify that explicitly.

After then, I am telling it to return 0 if the code executes successfully. You can remove the return 0 if you want. The code will work itself successfully.

Here, you see that I am using std:: explicitly, and I have to do that each time I want to print something using cout or take input from the user using cin. That seems kind of a hassle sometimes. I can reduce that hassle fully!

Code Using using namespace std

If I do not want to specify that I want the standard cin / cout each time I write cin or cout, then I can add using namespace std just after the header file. It will work exactly like earlier, and I also do not even need to write std:: each time I write cin/cout.

#include <iostream> // iostream = input output stream
using namespace std;

int main()
{
    cout << "Hello World"; // cout = console out / console output
    return 0;
}

That's it! 😉

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