Keywords are preserved words that have special meaning in C language. The meaning of C language keywords has already been described to the C compiler. These meaning cannot be changed. Thus, keywords cannot be used as variable names because that would try to change the existing meaning of the keyword, which is not allowed.(Don’t worry if you do not know what variables are, you will soon understand.) The keywords are also called “Reserved words “.There are total 32 keywords in C language.
What are Identifiers?
In C language identifiers are the names given to variables, constants, functions and user-define data. These identifier are defined against a set of rules.
int myvariable = "LetUsLearn";
myvariable is the name or identifier for the variable which stores the value “LetUsLearn” in i
In C language characters are grouped into the following catagories,