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A variable is a name that used to store data values in memory allocation. It my take different values at different time during execution but one at a time.
Constants in C language refer to fixed value that cannot change during the execution of a program.
A keywords are a reserved words for doing specific tasks. All keywords have fixed meanings
Identifiers are user defined words and refer to the names of variable, function arrays, structure,etc.
The character, that can be used to words and expression depend upon the computer which the program is run.
abbreviation list related to computer