bitwise and of numbers range

/*
Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive.

Example 1:

Input: [5,7]
Output: 4
Example 2:

Input: [0,1]
Output: 0
*/

class Solution {  
public:
    int rangeBitwiseAnd(int n, int m) {
    /*int res=0;
        while(m && n){
       int a=msb(m);
        int b=msb(n);
        if(a!=b) break;
           int msbval = 1<<a;
            res=res+a;
            m-=msbval;
            n-=msbval;
            
    }
return res;*/
        
        while(n<m){
            m-= (m & -m);
        }
return m;
        
}
    
    /*private:
    int msb(int n){
        int c=0;
        while(n){
            n=n>>1;
            c++;
        }
    return c;
    }*/
};