public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
System.out.println("请输入一个三位数");
int n = scan.nextInt();
//计算百位 十位 各位
int b100 =n/100;
int b10 =n/10%10;
int b1 =n%10;
int sum = b100+b10+b1;
System.out.println(sum);
}
}
运行结果: