题解 | #求int型正整数在内存中存储时1的个数#

// 输入数字%2，若不为0，则结果加1，输入减半
using System;

namespace HJ15{
    class Solution{
        public static void Main(){
            var num = Convert.ToInt32(Console.ReadLine()); 
            var res = 0;
            while(num != 0){
                if(num % 2 !=0){
                    res++;                  
                }
                num /= 2;
            }       
            Console.WriteLine(res);           
        }
    }
}