第1个回答 2016-10-20
import java.util.Scanner;
public class test2 {
private static Scanner input= new Scanner(System.in);
public static void main(String[] args){
long num;
do{
System.out.print("\nInput your num: ");
num=input.nextLong();
}while(num<0||num>1000);
int sum=0;
while(num>0){
sum+=num%10;
num/=10;
}
System.out.println("\nThis is sum: "+sum);
}
}本回答被网友采纳