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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/../c/numeric/random/RAND_MAX.html below:

RAND_MAX - cppreference.com

#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.

#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 generator
    printf("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: 2147483647
INT_MAX: 2147483647
Random value on [0,1]: 0.362509

• 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>

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