View source for c/numeric/random/RAND MAX

{{title|RAND_MAX}}
{{c/numeric/random/navbar}}
{{ddcl | header=stdlib.h |
#define RAND_MAX /*implementation defined*/
}}

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

===Example===
{{example|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 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);
}
|p=true|output=
RAND_MAX: 2147483647
INT_MAX: 2147483647
Random value on [0,1]: 0.362509
}}

===References===
{{ref std c17}}
{{ref std | section=7.22/3 | title=General utilities <stdlib.h> | p=248}}
{{ref std end}}
{{ref std c11}}
{{ref std | section=7.22/3 | title=General utilities <stdlib.h> | p=340}}
{{ref std end}}
{{ref std c99}}
{{ref std | section=7.20/3 | title=General utilities <stdlib.h> | p=306}}
{{ref std end}}
{{ref std c89}}
{{ref std | section=4.10   | title=GENERAL UTILITIES <stdlib.h>}}
{{ref std end}}

===See also===
{{dsc begin}}
{{dsc inc | c/numeric/random/dsc rand}}
{{dsc inc | c/numeric/random/dsc srand}}
{{dsc see cpp | cpp/numeric/random/RAND_MAX}}
{{dsc end}}

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