Hello World in C++ | By Aryan

 Hello World Program in C++

In this Post you will learn how to write your first program Hello World in C++.

We will first write Code and then its Explanations.

CODE:

#include<iostream>

using namespace std;

int main()

{

    cout<<"Hello World!";

    return 0;

}

OUTPUT:

Hello World!

Explanation

#include<iostream>

It is the header file which contains all the functions of program like cout, cin etc. and #include tells the preprocessor to include these header file in the program

using namespace std;

The using namespace statement just means that in the scope it is present, make all the things under the std namespace available without having to prefix std:: before each of them.

int main()

int main – 'int main' means that our function needs to return some integer at the end of the execution and we do so by returning 0 at the end of the program. 0 is the standard for the “successful execution of the program”. main – In C89, the unspecified return type defaults to int.

cout<<"Hello World!";

cout prints the content inside the quotation marks. It must be followed by << followed by the format string. In our example, "Hello World!" is the format string.

return 0;

It is used to return a value from the function or stop the execution of the function.

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