import java.util.Scanner;
public static void main(String[] args) {
Scanner scn=new Scanner (System.in);
System.out.print("a="+a+", b="+b+", 請輸入運算符號: ");
char oper=scn.next().charAt(0); //取得第一個字元
System.out.println(a+"+"+b+"="+(a+b));
System.out.println(a+"-"+b+"="+(a-b));
System.out.println(a+"*"+b+"="+(a*b));
System.out.println(a+"/"+b+"="+(a/b));
System.out.println("不清楚此運算符號");