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The most common implementation of the C language is known as C89, but is now superseded by C99.

This version of the language has been ratified by ANSI as ANSI X3.159-1989 "Programming Language C" and ISO/IEC 9899:1990.

C89 headers[]

  • assert.h
  • ctype.h
  • errno.h
  • float.h
  • limits.h
  • locale.h
  • math.h
  • setjmp.h
  • signal.h
  • stdarg.h
  • stddef.h
  • stdio.h
  • stdlib.h
  • string.h
  • time.h
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