On Tue, 18 Sep 2018 at 14:09, Xi Ruoyao wrote:
>
> On 2018-09-18 17:52 +0530, Neha Gowda wrote:
> > Hi,
> >
> > I am trying to run the following testcase for Random Number Generator
> > function.
> > The testcase returns true when generated number is RAND_MAX and returns
> > false when its not generated.
> >
> > Command :- gcc -m32 -O2 test.c
> > ======================================================
> > #include <stdio.h>
> > #include <stdlib.h>
> >
> > int main()
> > {
> > unsigned int i;
> > float f;
> > srand(0);
> > for (i = 0; i <= RAND_MAX; i++) {
> > f = rand();
>
> There is a rounding error introduced since a float can not represent
> all integer values in [0, RAND_MAX].
>
> > if (f == RAND_MAX) {
>
> RAND_MAX is 2147483647 on 32-bit GNU/Linux. It can not be represented
> by a float.
Which leads to the question, why are you using float anyway?
rand() returns an int, not a float.
