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Overview of stdlib.h

The stdlib.h header file provides groups of closely related functions for string conversion, pseudo-random number generation, memory management, environment communication, searching and sorting, multibyte character conversion, and integer arithmetic.

The string conversion functions are

The pseudo-random number generation functions are

  • "rand"
  • "srand"

    • The memory management functions are

  • "calloc"
  • "free"
  • "malloc"
  • "realloc"
  • "vec_calloc"
  • "vec_free"
  • "vec_malloc"
  • "vec_realloc"

    • The environment communication functions are

  • "abort"
  • "atexit"
  • "exit"
  • "getenv"
  • "_putenv"
  • "system"

    • The searching and sorting functions are

  • "bsearch"
  • "qsort"

    • The multibyte conversion functions convert locale-specific multibyte characters to wchar_t type characters (defined in stddef.h). The functions are

  • "mblen"
  • "mbstowcs"
  • "mbtowc"
  • "wcstombs"
  • "wctomb"

    • The integer arithmetic functions are

  • "abs"
  • "div"
  • "labs"
  • "llabs"
  • "ldiv"

    • Many of the stdlib.h functions use the size_t type and the NULL macro, which are defined in stdlib.h.

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