Defined in header <stdlib.h>
#define RAND_MAX /*implementation defined*/

Expands to an integer constant expression equal to the maximum value returned by the function rand(). This value is implementation dependent. It's guaranteed that this value is at least 32767.


  • C11 standard (ISO/IEC 9899:2011):
    • 7.22/3 General utilities <stdlib.h> (p: 340)
  • C99 standard (ISO/IEC 9899:1999):
    • 7.20/3 General utilities <stdlib.h> (p: 306)
  • C89/C90 standard (ISO/IEC 9899:1990):
    • 4.10 GENERAL UTILITIES <stdlib.h>

See also

generates a pseudo-random number
seeds pseudo-random number generator
C++ documentation for RAND_MAX

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