Identifiers
As we're writing a program, we'll
have to choose names for variables, functions, macros, and other entities.
These names are called identifiers. In C, an identifier may contain
letters, digits, and underscores, but must begin with a letter or underscore.
(In C99, identifiers may contain certain “universal character names” as well.)
C is case-sensitive: it distinguishes between
upper-case and lower-case letters in identifiers. For example, the following
identifiers are all different:
job joB job jOB Job JoB JOb JOB.
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