#include <iostream>

using namespace std;

int main()

{

char op;

float num1, num2;

cout << "輸入運算子：+、-、*、/ : ";

cin >> op;

cout << "輸入兩個數: ";

cin >> num1 >> num2;

switch(op)

{

case "+":

cout << num1+num2;

break;

case "-":

cout << num1-num2;

break;

case "*":

cout << num1*num2;

break;

case "/":

cout << num1/num2;

break;

default:

// 如果運算子不是 +, -, * 或 /, 提示錯誤資訊

cout << "Error! 請輸入正確運算子。";

break;

}

return 0;

}