求int型正整数在内存中存储时1的个数

 

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

Scanner in = new Scanner(System.in);

int num = in.nextInt(); //读取数字

int n = 0; //计数变量

for (int i = 0; i < 32; i++) {

if ((num & 1) == 1) {

//如果末位为1则计数

n++;

}

//无符号右移

num = num >> 1;

}

System.out.println(n);

}

}