思路:
mod 10获取最低位,除以10去掉最低位
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int sum = 0;
while(n>0) {
sum = sum + n%10;
n = n/10;
}
sc.close();
System.out.println(sum);
}
}