What is printf() and scanf() :- function , array or what else???

Answer 1

printf() and scanf() functions are inbuilt library functions in C programming language which are available in C library by default. These functions are declared and related macros are defined in “stdio.h” which is a header file in C language.
In which:
1.printf is used for output
2.scanf is used for reading inputs

Answer 2

Functions, because they have parameters bound by parenthesis which take arguments.

Answer 3

but it doesn't return any value and does not have any return type