Explain how the compiler acts on the declaration, definition and invocation of a function in a program. Explain the circumstances when the return value of the following functions may or may not be...

Explain how the compiler acts on the declaration, definition and invocation of a function in

a program.

Explain the circumstances when the return value of the following functions may or may not

be ignored: printf, scanf, getchar.

Explain why the names of the arguments used to invoke a function don’t conflict with the

names used for the parameters in the function definition.