importjava.util.Scanner;

publicclassTest{

publicstaticvoidmain(String[]args){

Scannerscanner=newScanner(System.in);

System.out.print("請輸入第一個數字：");

doublefirst=scanner.nextDouble();

System.out.print("請輸入運算子（+-*/%）：");

charoperator=scanner.next().charAt(0);

System.out.print("請輸入第二個數字：");

doublesecond=scanner.nextDouble();

doubleresult=0D;

switch(operator){

case"+":

result=first+second;

break;

case"-":

result=first+second;

break;

case"*":

result=first*second;

break;

case"/":

result=first/second;

break;

case"%":

result=first%second;

break;

default:

result=first-second;

break;

}

System.out.println(first+""+operator+second+"="+result);

}

}

----------testing

請輸入第一個數字：10

請輸入運算子（+-*/%）：/

請輸入第二個數字：2

10.0/2.0=5.0