The tokens which have predefined meaning in C language are called keywords.C programs are constructed from a set of reserved words which provide control from libraries which perform some special functions, these reserved words in C library are called keywords.
Rules followed while using the keywords:-
- The keywords should not be used as variable, function names, array names etc.
- The meaning of the keywords cannot be changed by the user.
- All keywords should be written in lower case letters.
Note: We should never use capital letters while using keywords.If we use capital letters for keywords, they are treated as an identifiers.