#include <stdio.h>
#include <limits.h>

int DivByShifting1(int n, unsigned shift)
{
  int sgn = n >> ((sizeof(int) * CHAR_BIT) - 1);
  return ((((n + sgn) ^ sgn) >> shift) + sgn) ^ sgn;
}

int main(void)
{
  int n, s;
  for (n = -10; n <= 10; n++)
    for (s = 0; s <= 4; s++)
      printf("%d / %d = %d\n", n, 1 << s, DivByShifting1(n, s));
  return 0;
}