题解 | #求int型正整数在内存中存储时1的个数#

辗转相除法，每次除以2获取余数是1还是0即可

import java.util.*;
import java.util.function.Consumer;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int num = sc.nextInt();

        int count = 0;
        while (num > 0) {
            int n = num % 2;
            if (n == 1) count++;
            num /= 2;
        }
        System.out.println(count);
    }
}