Keywords are those tokens or words whose meaning are already defined within the C language and cannot be changed. As an analogy, in English language the meaning of verbs, adjectives, common nouns, and so on is pre-defined and can’t be changed. These tokens of English language are its keywords. Similarly, in C language some tokens are reserved and have some pre-defined meaning. These keywords serve as the basic building blocks for program statements. The number of keywords present in C language is 32 as per ANSI standard. Table – 1 shows this list of keywords.
Table – 1: Keywords in C language