方法一
import java.io.*;
import java.util.*;
public class Main{
public static void main(String[] args) throws Exception{
Scanner sc = new Scanner(System.in);
while(sc.hasNextInt()){
int n = sc.nextInt();
System.out.println(Integer.bitCount(n));
}
}
}
方法二
import java.io.*;
import java.util.*;
public class Main{
public static void main(String[] args) throws Exception{
Scanner sc = new Scanner(System.in);
while(sc.hasNextInt()){
int n = sc.nextInt();
int count = 0;
while(n != 0){
if((n&1) == 1){
count++;
}
n >>>= 1;
}
System.out.println(count);
}
}
}