randu.c

#include <stdio.h>
#include <time.h>
unsigned long Rand(const unsigned long x) {
  return ((x << 16) + (x << 1) + x) & 0x7FFFFFFF;
}
unsigned long RandInt(const unsigned long x, const unsigned long a,
                      const unsigned long b) {
  return a + x / (0x7FFFFFFF / (b - a + 1) + 1);
}