题解 | 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 scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        String str = Integer.toBinaryString(n);
        int count = 0;
        for (int i = 0; i < str.length(); i++) {
            if (str.charAt(i) == '1') count++;
        }
        System.out.println(count);
    }
}