题解 | #求int型正整数在内存中存储时1的个数#

public class Main {
     public static void main(String[] args){
         Scanner sc = new Scanner(System.in);
         if(sc.hasNext()){
             int num = sc.nextInt();
             String  s= Integer.toBinaryString(num);
             //然后遍历这个数组
             int count=0;
             for(int i=0;i<s.length();i++){
                 if(s.charAt(i)=='1'){
                     count++;
                 }
             }
             System.out.print(count);
         }
     }
}