Before you can do anything in any language,you
must at least know how you name an identifier. An identifier is
used for any variable ,function, data defintion etc. In the
programming language C, an identifier is a combination of alpha
numeric characters, the first being the letter of an alphabet or an
underline, and the remaining being any letter of the alphabet, any
numeric digit, or the underline. Two rules must be kept in mind
while naming an identifier.
1. The case of the alphabetic character is significant. Using
"INDEX" for a variable is not the same as using "index" and neither
of them is the same as using "InDex" for a variable. All three
refer to different variables.
2. As C is defined,
up to eight significant characters can be used and will be
considered significant. If more than eight are used, they may be
ignored by the compiler. The HiTech C compiler used with the Applix
1616 alllows 31 significant characters, and prepends an underscore
( _ ).
It should be pointed out that some C
compilers allows use of a dollar sign in an identifier name, but
since it is not universal, it will not be used anywhere in this
tutorial. Check your documentation to see if it is permissible for
your particular compiler.
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