Question

which of the following is invalid header file in c

Answer 1

See nothing is invalid all is best!!

Answer 2

(B) mathio .h

Explanation:

• In C language, header files contain the set of predefined standard library functions.
• The “#include” preprocessing directive is used to include the header files with “.h” extension in the program.
• The main header used is <stdio.h> before the start of every program.
• Your question is incomplete, maybe your complete question was:-
• What is the following is invalid header file in C?
• (A) math.h
• (B) mathio.h
• (C) string.h
• (D) ctype.h
• The correct option is mathio.h