Number Complement @LeetCode

PROBLEM :

Given a positive integer, output its complement number. The complement strategy is to flip the bits of its binary representation.

Note:
The given integer is guaranteed to fit within the range of a 32-bit signed integer.
You could assume no leading zero bit in the integer’s binary representation.

Example 1:
Input: 5
Output: 2
Explanation: The binary representation of 5 is 101 (no leading zero bits), and its complement is 010. So you need to output 2.

Example 2:
Input: 1
Output: 0
Explanation: The binary representation of 1 is 1 (no leading zero bits), and its complement is 0. So you need to output 0.

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SIMPLE c++ IMPLEMENTATION :
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class Solution {
public:
    int findComplement(int num) {
        int copy=num ;
        int pos=0 ;
       
        while(copy){
            num=num^(1<<pos) ;
            pos++ ;
            copy=(copy>>1) ;
        }
        return num ;
    }
};

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