C++ "Hello, World!" Program

Program to Display "Hello, World!"

// Your First C++ Program to print "Hello World!"

// header file for input-output functions
#include <iostream>

// main function - where the execution of program begains
int main() 
{
    // print hello world
        std::cout << "Hello World!";
        return 0;
}

Output

Hello World!

How "Hello, World!" program works?

1. // Your First C++ Program to print "Hello World!" :- In C++, any line starting with // is a comment. Comments are intended for the person reading the code to better understand the functionality of the program. It is completely ignored by the C++ compiler.
2. #include <iostream> :- The #include is a preprocessor directive used to include files in our program. The above code is including the contents of the iostream file which contains declarations of all the standard input/output liberary functions.
   
   This allows us to use cout in our program to print output on the screen.
3. For now, just remember that we need to use #include <iostream> to use cout that allows us to print output on the screen.
4. int main() {...} :- A valid C++ program must have the main() function. A function is a group of statements that are designed to perform a specific task. The curly braces indicate the start and the end of the function.
   
   The execution of code beings from this function.
5. std::cout << "Hello World!"; :- std::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.
   
   

   Note: ; is used to indicate the end of a statement.

6. return 0; :- The return 0; statement is the "Exit status" of the program. In simple terms, the program ends with this statement.

Things to remember from the above program

• We must include iostream if we want to use std::cout in our C++ programs.
• We use std:cout in order to print output on the screen.
• The execution of code begins with the main() function. This function is mandatory. This is a valid C++ program that does nothing.
• It's mandatory To prints the Statement inside the quotation marks "".
• Semi-colon ; is used to indicate at the end of a statement.
• The return 0; statement is used to "End" the program.

int main() {
     // you can Write your code here
     // This is a valid C++ program that does nothing.
}

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