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
http://www.nowcoder.com/practice/1b46eb4cf3fa49b9965ac3c2c1caf5ad
Integer.toBinaryString(val) 算是使用了简便方法
import java.util.*; public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); while (in.hasNextInt()) { Integer a = in.nextInt(); String str = Integer.toBinaryString(a); int count = 0; for (int i = 0; i < str.length(); i++) { if ('1' == str.charAt(i)) { count++; } } System.out.println(count); } } }