bit位数

Java最简单的写法

import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()){
            System.out.println(Integer.bitCount(sc.nextInt()^sc.nextInt()));
        }
    }
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        int m = sc.nextInt();
        int n = sc.nextInt();
        int sum=0;
        String ml = Integer.toBinaryString(m);
        String nl = Integer.toBinaryString(n);
        int q = new StringBuffer(ml).length() > new StringBuffer(nl).length() ? new StringBuffer(ml).length():new StringBuffer(nl).length();
        char[] mArr = new char[q];
        char[] nArr = new char[q];
        for(int i=0;i<q;i++){
            mArr[i]=nArr[i]='0';
        }
        
        for(int i=q-1,j=ml.length()-1;i>=0 && j>=0;i--,j--){
            mArr[i] = ml.charAt(j);
        }
        
        for(int i=q-1,j=nl.length()-1;i>=0 && j>=0 ;i--,j--){
            nArr[i] =nl.charAt(j);
        }
        
//        for(int i =0;i<q;i++){
//            System.out.print(mArr[i]+" ");
//        }
//        System.out.println();
//        for(int i =0;i<q;i++){
//            System.out.print(nArr[i]+" ");
//        }
//        
        for(int i=0;i<q;i++){
            if(mArr[i]!=nArr[i]){
                sum++;
            }
        }
        System.out.println(sum);
    }
}