UMBC CMSC 201
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An identifier in a programming language is a name used for a variable or function or datatype.
Identifiers in C may be composed of letters, digits, and underscores. They may NOT be a keyword, or begin with a digit.
In C, the case of a character matters, so FOO, Foo and foo are all distinct identifiers.
A common programming convention is to use a change in case to "break up" a long identifier to suggest its meaning to a human reader, as in averageAge and ageInYears.
The underscore character can be used to do this also, as in average_age and age_in_years.