Which statement is correct regarding the main() function in C++? I. It is a…

Concept

A function is user-defined when the programmer supplies its definition in the program. A pre-defined or library function is supplied by the language implementation or a library.

A language can reserve a function name and give that function a special role without supplying the function body itself.

Application

1. A hosted C++ program provides a function named main() at global scope.

2. The programmer writes the definition and body of main() in the source program.

3. The C++ implementation gives this programmer-defined function its special role: program execution begins by invoking main().

4. Therefore, Statement I is true and Statement II is false.

Contrast

• Only I: reflects that the program supplies the definition of main().

• Only II: confuses the implementation-defined entry-point role with a pre-supplied function body.

• Both I and II: combines two different sources of a function definition.

• Neither I nor II: overlooks that the program contains the definition of main().

Cross-check

A source program cannot merely include a standard header to obtain main(); it must define main(). Hence the result is Only I.