C13. C 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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