class Solution {
public:
    uint32_t reverseBits(uint32_t n) {
        uint32_t k=0;
        uint32_t a=1;

        for(int i=0;i<=31;i++){
            if((n&a)==0)/* we can also use if(n%2==0)*/
                k=k<<1;
            else
            {
                k=k<<1;
                k=k|1;
            }
            n=n>>1;
         }
        return k;


    }
};