Help!! Random Integer Generator Algorithm

Currently, I need a generator of random integer between 0 and 36. And
this generator cannot contain any float operation. I tried
srand48+lrand48 in GNU C Library. I get a random integer each time I
invoke lrand48 and make the result mod 37. I try this 17804294 times.
but the result is not fine. For example, there are 479571 "7" but
482212 "3".

What should I do? Does "mod" operation cause this result?

Thanks!

.

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