题解 |HJ62 #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.*;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
while (scanner.hasNextInt()) {
int i = scanner.nextInt();
double v = Math.pow(2, 31) - 1;
// 2567237
if (1 <= i && i <= v) {
String str = Integer.toBinaryString(i);
char[] chars = str.toCharArray();
int num = 0;
for (char ch : chars) {
if (ch == '1') {
num++;
}
}
System.out.println(num);
}
}
}
}
