Identifiers are:- constant variables keywords Define constant:- Any information is constant data = information = constant types of constant primary:- integer,real,character secondary:- they are made with the help of primary such as:- array,string,pointer,union,etc. Define variables:- variables are the name of memory location where we store data variable name is any combination of alphabet,digit the first letter cannot be a digit Keywords:- keywords are the predefined or reserved words.In C there are 31 keywords.C is a case sensitive so use keyword in small alphabets.
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