Question

从键盘接收一个三位数，求出个位、十位、和百位，将各位的数相加，并输出和的应用程序。用java编写

Answer 1

import java.util.Scanner;
public class Test {

public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
while(n <100 || n > 999){
System.out.println("对不起，您的输入有误，请重新输入一个三位数：");
n = sc.nextInt();
}
int a = n%10;//a是个位数；
int b = (n%100)/10;//b是十位数；
int c = n/100;//c是百位数；
int sum = a + b + c;
System.out.println("百位数是："+c+"\t十位数是："+b+"\t个位数是："+a);
System.out.println("各位相加之和是："+ sum);
}
}
呵呵，搞定啦。

Answer 2

public class Test {
public static void main(String[] args){
try {
int a = System.in.read();
int b = System.in.read();
int c = System.in.read();
System.out.println(a+b+c-144);
} catch (IOException e) {
e.printStackTrace();
}
}
}