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Code font in text

Most developer documentation uses code font for computer-language elements in text. Whether to use code font in text for other documents is a matter of judgment.

Use code font for all text fragments that represent expressions in a programming language.
Use code font for names of files, volumes, directories, and libraries.
StandardCRuntime.o library
MainProg.c file
Don’t use a function or method name as a verb.
Correct: Run ls on both directories.
Incorrect: ls both directories.
Correct: Use cd to change to the root directory.
Incorrect: cd to the root directory.
Don’t mix fonts within a single word. Rewrite to avoid forming the plural of a word in code font.
Correct: values of type integer
Incorrect: integers
Use regular text font, not code font, for punctuation following a word or phrase in code font, unless the punctuation mark is part of the computer-language element represented.
NAN(004), nan(4), and NaN are examples of acceptable input.

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Apple Style Guide

Code font in text