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Preprocessor Directive - In this section we telling the compiler to preprocessed code from included header file. In our case iostream which contains all essential functions we can use like cout.
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Main Function - It’s entry point of the program. In main we use defined or declared elements e.g header files or our own functions. Without it program will not run.
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Expression Statements - An expression statements are simply an expressions followed by a semicolon.
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Declaration Statements - Declaration Statements are declarations of e.g the variable.
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Return Statement - It returns value 0 to the main function. The return 0 means success and returning a non-zero number means failure.
