利用栈实现简单计算器的例子(Calculator)

利用栈实现简单计算器的例子(Calculator)(2)             case '-': result = operand1 - operand2; break;
            case '*': result = operand1 * operand2; break;
            case '/':
                if (operand2 == 0) {
                    cerr << "Divided by 0!" << endl;
                    s.ClearStack();
                    return;
                }
                else result = operand1 / operand2;
                break;
        }
        s.Push(result);
    }
    //清空操作数栈
    void Clear() { s.ClearStack(); }
public:
    //构造函数，建立一空栈
    Calculator(void) {}
    //计算表达式的值
    void Run() {
        char    op;
        double  operand;
        while (1) {
            cin >> op;
            if (cin.eof()) return;
            while (op != '=') {