#include<iostream>

using namespace std;

int main(){
    cout<<"hello world"<<endl;
}

/*
This program begins by including the "iostream" library, which provides input/output
functionality for the program. The "using namespace std;" statement allows the 
program to use the "cout" and "endl" objects, which are used to print output to the
screen.

The "main()" function is the entry point of the program, and contains the code that
will be executed when the program is run. In this case, the code inside the main 
function uses the "cout" object to print the message "Hello, world!" to the screen,
followed by an end-of-line character. The "return 0;" statement indicates that the
program has completed successfully.

Once the program has been written and saved, it can be compiled and run using a C++
compiler. The exact steps for doing this will vary depending on the compiler that
you are using and the operating system that you are running.


The "using namespace std;" statement allows all elements of the standard C++
library to be accessed without the "std::" prefix. For example, if the "using
namespace std;" statement is used, the "cout" and "cin" objects can be used 
directly, instead of having to be prefixed with "std::".

On the other hand, the "std::" prefix can be used to explicitly specify that an
element of the standard C++ library is being used. For example, the "std::cout" 
and "std::cin" objects can be used in this way.

Which approach is best to use depends on the situation and the preferences of the
programmer. Some programmers prefer to use the "using namespace std;" statement to
avoid having to type the "std::" prefix repeatedly, while others prefer to use 
the "std::" prefix to make it explicit that elements of the standard C++ library
are being used.

In general, it is considered good practice to use the "using namespace std;" 
statement only in small programs or in the global namespace, and to use the "std::"
prefix when working with larger programs or in local scopes. This can help to
avoid naming conflicts and can make the code easier to read and understand.

*/