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Answer:
a) a variables in nothing but a name give to a storage area that our programs can manipulate. Each variable in C has a specific type which determines the size and layout of the variables memory and the set of operation that can be applied to the variable.
a variable can start with the alphabet and underscore only it can't start with a digit no white space is allowed with in the variable name a variable name must not be any reserved word or key word eg: int, goto etc
b) int can't used as an identifier name because their is a reserved meaning for this word defined in the c++ diary
c) Being a middle level language C refuses the gap level between the low level and high level languages. It can be used for writing operating system as well as doing application level programming. Helps to understand the fundamentals of computer theories