A keywords are a reserved words for doing specific tasks. All keywords have fixed meanings and these meanings cannot be changed. Keywords are a predefined in C. These words have a standard and reserve as basic building blocks for program statements. There are only 32 keywords in C and all words must be written in lowercase.
The list are keywords are available in C :-
auto break case char const continue default do double else enum extern float for goto if int long register return short signed sizeof static struct switch typedef union unsigned void volatile while