The statements and their uses in the c++

hello there guys.i am going to about the statements.first of we have the preprocesser directive, the main function ,the expression/declaration statements, and the return function.
the expression followed by a semicolon is a expression statement.
preprocesser directive is a type of function that allows us to start a {probably} long program.
the main function is a like a folder for all the codes we have written in the program.
the declaration statement is a statement that declares our variables in the program.
the return function is probably used to return the entire program to the compiler and translate it and check whather it has any problems or not.

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