C standard may refer to:
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ANSI C,
C99,
C11,
C17, or
C23, specifications of the C programming language
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C standard library
The C standard library, sometimes referred to as libc, is the standard library for the C (programming language), C programming language, as specified in the ISO C standard.International Organization for Standardization, ISO/International Electrote ...
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C tuning (guitar), a type of tuning for guitars
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