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);
}
}
}
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