C character classification is an operation provided by a group of functions in the ANSI C Standard Library for the C programming language. These functions are used to test characters for membership in a particular class of characters, such as alphabetic characters, control characters, etc. Both single-byte, and wide characters are supported.
Read more about C Character Classification: History, Implementation, Overview of Functions
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“For character too is a process and an unfolding ... among our valued friends is there not someone or other who is a little too self confident and disdainful; whose distinguished mind is a little spotted with commonness; who is a little pinched here and protruberent there with native prejudices; or whose better energies are liable to lapse down the wrong channel under the influence of transient solicitations?”
—George Eliot [Mary Ann (or Marian)