#include <iostream>
 
int main()
{
    std::cout << "Hello World";
    return 0;
}

This is how it can be reduced.

Commands for preprocessors and header files

Classes, keywords, constants, operators, and other built-in components from the standard C++ library are frequently used in C++ programmes. To make use of such pre-defined elements, a programme must contain the proper header file.

The line #include iostream> was added to the programme above in order to include the header file iostream. We may obtain input data and display output data with the aid of the iostream library. The iostream library is not only restricted to input and output; it also provides a wide range of other uses and error facilities.Header file are both system defined and user defined. To know more about header files, go to the documentary here, https://en.cppreference.com/w/cpp/header.

Definition Section

The declaration of all variables and other user-defined data types can be found here. All of the functions and the programme use these variables.

Declaration of Function

Here, all the necessary functions for a programme are declared after all the other entities have been defined. These are often defined by the user.

Every programme has a main parent function that instructs the compiler where to begin the program’s execution.

The main function contains a complete list of the statements that must be executed.

The compiler only considers the instructions enclosed in curly brackets for execution.

Control leaves the main function once all of the instructions in the function have been completed, and the programme ends.

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