Java Integer.toBinaryString()
求int型正整数在内存中存储时1的个数
http://www.nowcoder.com/questionTerminal/440f16e490a0404786865e99c6ad91c9
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int a = sc.nextInt();
char[] chars = Integer.toBinaryString(a).toCharArray();
int num = 0;
for(char c : chars) {
if(c == '1') num++;
}
System.out.print(num);
}
}
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