题解 | #查找输入整数二进制中1的个数#
查找输入整数二进制中1的个数
https://www.nowcoder.com/practice/1b46eb4cf3fa49b9965ac3c2c1caf5ad
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
while (in.hasNextInt()) {
int num = in.nextInt();
//Integer包装类的toBinaryString方法转二进制字符串
String binaryNum = Integer.toBinaryString(num);
//去掉二进制字符串的1保留0
String ans = binaryNum.replace("1", "");
System.out.println(binaryNum.length() - ans.length());
}
}
}