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In C++, the # symbol is used to indicate a preprocessor directive. When you see #include <isotream>, it tells the preprocessor to include the contents of iostream header file in your program before actual compilation begins.

In C++, int main() is the standard entry point for a C++ program. Here's a simple breakdown:

int: This indicates that the function returns an integer value. By convention, returning 0 typically signifies that the program executed successfully.

main: This is the name of the function where the execution of the program begins.

The std namespace in C++ is part of the Standard Library, which provides a rich set of functions, classes, and objects to help with various programming tasks.

A namespace is a declarative region that provides a scope to the identifiers (the names of types, functions, variables, etc.) inside it. Namespaces are used to organize code into logical groups and to prevent name collisions that can occur especially when your code base includes multiple libraries.

In C++, the double colon :: is known as the scope resolution operator. It is used to define the scope in which a particular identifier (such as a variable, function, or class) resides.

cout: character output

endl: end line

In C++, return 0; is used in the main function to indicate that the program has executed successfully.

Using std::cout << std::endl << std::endl; in C++ will print two newline characters to the console, effectively creating a blank line between outputs.

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