HDOJ(HDU) 2113 Secret Number(遍历数字位数的每个数字)

import java.util.Scanner;
public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        boolean isFirst = true;
        while(sc.hasNext()){
            long n = sc.nextLong();
            if(isFirst){
                isFirst=false;
            }else{
                System.out.println();
            }
            long sum =0;
            long k=0;
            while(n>0){
                k=n%10;
                if(k%2==0){
                    sum+=k;
                }
                n=n/10;
            }
            System.out.println(sum);
        }
    }
}