Dsa Bit Power Of Two

In this tutorial, you'll learn about How to Fix Power of Two Errors. We cover key concepts, practical examples, and best practices.

Fix power of two errors when edge case 0 returns True or bit count method not used.

Quick Fix

Wrong

def is_power(n):
    return n & (n-1)==0

n=0 returns True (0&(-1)==0) but 0 is not power of two.

Right

def is_power(n):
    return n>0 and n&(n-1)==0

1->True, 2->True, 4->True, 8->True, 0->False, 3->False. O(1).

Prevention

Powers of two have exactly one set bit. n&(n-1)==0 checks this. Must exclude n=0.

DodaTech Tools

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