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C variable and Keywords


      C Introduction variable and  Keywords

Rules for Constructing Character Constants

1.    A character constant is a single alphabet a single digits or a single 
     Special symbol enclosed within single inverted commas.
2.    The Maximum length of a character constant can be 1 character.

Variables: -

    In C a quantity that may vary during program execution is called a variable.

Rules for Constructing Variable Name


1.    A variable name is any combination of alphabets, digits or underscores.
2.    The first character in the variable name must be an alphabet.
3.    No Commas or blank are allowed within a variable name.
4.    No special symbol other than an underscore can be used in a variable name.

Keywords:
Keywords are the words whose meaning has already been explained to the C compiler
There are only 32 Keywords



Auto            double            if            static
Break            else                int            struct
Case            enum                long            switch
Char            extern                near            typedef
Const            float                register        union
Continue        far                return            unsigned
Default        for                short            void
Do             goto                signed        while

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