c - Divide by 9 without using division or multiplication operator -


this question have tried solve couldn't way. pointers appreciated.

regular subtraction way of doing division not intention here, ingenious way of using shifting operator done intention.

here's solution heavily inspired hacker's delight uses bit shifts:

def divu9(n):     q = n - (n >> 3)     q = q + (q >> 6)     q = q + (q>>12) + (q>>24); q = q >> 3     r = n - (((q << 2) << 1) + q)     return q + ((r + 7) >> 4)     #return q + (r > 8)

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