题解 | #求int型正整数在内存中存储时1的个数#
求int型正整数在内存中存储时1的个数
http://www.nowcoder.com/practice/440f16e490a0404786865e99c6ad91c9
妙啊，将“1”替换为空，得到差值即可
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int num = sc.nextInt();
String str = Integer.toBinaryString(num);
int length = str.length();
String newStr = str.replaceAll("1", "");
System.out.println(length - newStr.length());
}
}