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      RAND_MAX

      From cppreference.com
      <c‎ |numeric‎ |random
       
       
       
       
      Defined in header<stdlib.h>
      #define RAND_MAX /*implementation defined*/

      Expands to an integer constant expression equal to the maximum value returned by the functionrand(). This value is implementation dependent. It's guaranteed that this value is at least32767.

      [edit]Example

      Run this code
      #include <limits.h>#include <stdio.h>#include <stdlib.h>#include <time.h> int main(void){srand(time(NULL));// use current time as seed for random generatorprintf("RAND_MAX: %i\n", RAND_MAX);printf("INT_MAX: %i\n",INT_MAX);printf("Random value on [0,1]: %f\n",(double)rand()/ RAND_MAX);}

      Possible output:

      RAND_MAX: 2147483647INT_MAX: 2147483647Random value on [0,1]: 0.362509

      [edit]References

      • C17 standard (ISO/IEC 9899:2018):
      • 7.22/3 General utilities <stdlib.h> (p: 248)
      • 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>

      [edit]See also

      generates a pseudo-random number
      (function)[edit]
      seeds pseudo-random number generator
      (function)[edit]
      C++ documentation forRAND_MAX
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=c/numeric/random/RAND_MAX&oldid=140566"
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