Question

我正在完成关于简单C ++程序的大学任务。到目前为止，我已经满足了大部分问题要求，但目前我仍然坚持未声明的标识符错误。提到的错误可以在代码的注释部分找到，其中注释包括术语“有问题的部分”。我的问题是，如何解决未声明的标识符错误？

如果您可以尝试编译源代码并查明问题，我将不胜感激。

构建错误：

1>c:\users\adrian khor\documents\visual studio 2013\projects\ict1101_as1_4\ict1101_as1_4\ict1101_as1_4.cpp(74): error C2065: 'feeReportTotalAfterDiscountedFee' : undeclared identifier

（MS Visual Studio Pro 2013）

#include "stdafx.h"
#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

int main()
{

    int qtyVehicleCar, qtyVehicleTaxi, qtyVehicleTruck;

    /* Text UI component */
    cout << "=====================================\n";
    cout << "=====================================\n";
    cout << "====== Malaysia Highway Company =====\n";
    cout << "=====================================\n";
    cout << "=====================================\n";
    cout << endl;

    cout << "Enter quantity of the vehicles on 1st January 2014: " << endl;
    cout << "Car\t\t:\t";
    cin >> qtyVehicleCar;

    cout << "Taxi\t\t:\t";
    cin >> qtyVehicleTaxi;

    cout << "Truck\t\t:\t";
    cin >> qtyVehicleTruck;

    /* Lay out the Report table */
    cout << endl << endl << endl;
    cout << "Report\n";
    cout << "--------\n";
    cout << endl;

    /* Processes */

    /* ============ */
    /* Declaration */
    /* ============ */
    // Report Items
    double feeOriginalCar, feeOriginalTaxi, feeOriginalTruck;
    feeOriginalCar = 2.00;
    feeOriginalTaxi = 1.00;
    feeOriginalTruck = 3.50;

    double feeTotalOriginalCar, feeTotalOriginalTaxi, feeTotalOriginalTruck;
    feeTotalOriginalCar = qtyVehicleCar * feeOriginalCar;
    feeTotalOriginalTaxi = qtyVehicleTaxi * feeOriginalTaxi;
    feeTotalOriginalTruck = qtyVehicleTruck * feeOriginalTruck;

    double rateDiscountCar, rateDiscountTaxi, rateDiscountTruck;
    rateDiscountCar = 2;
    rateDiscountTaxi = 10;
    rateDiscountTruck = 15;

    double feeTotalDiscountedCar, feeTotalDiscountedTaxi, feeTotalDiscountedTruck;
    feeTotalDiscountedCar = (rateDiscountCar / 100) * feeTotalOriginalCar;
    feeTotalDiscountedTaxi = (rateDiscountTaxi / 100) * feeTotalOriginalTaxi;
    feeTotalDiscountedTruck = (rateDiscountTruck / 100) * feeTotalOriginalTruck;

    double feeTotalAfterDiscountedCar, feeTotalAfterDiscountedTaxi, feeTotalAfterDiscountedTruck;
    feeTotalAfterDiscountedCar = feeTotalOriginalCar - feeTotalDiscountedCar;
    feeTotalAfterDiscountedTaxi = feeTotalOriginalTaxi - feeTotalDiscountedTaxi;
    feeTotalAfterDiscountedTruck = feeTotalOriginalTruck - feeTotalDiscountedTruck;

    // Final Output
    double feeReportTotalOriginalFee, feeReportTotalDiscountedFee, feeReportTotalAfterDiscounted;

    feeReportTotalOriginalFee = feeTotalOriginalCar + feeTotalOriginalTaxi + feeTotalOriginalTruck;
    feeReportTotalDiscountedFee = feeTotalDiscountedCar + feeTotalDiscountedTaxi + feeTotalDiscountedTruck;

    /* The problematic part #2*/
    /* feeReportTotalAfterDiscountedFee = feeReportTotalOriginalFee - feeReportTotalAfterDiscountedFee; */ /* OR */
     feeReportTotalAfterDiscountedFee = (feeTotalOriginalCar - feeTotalDiscountedCar) + (feeTotalOriginalTaxi - feeTotalDiscountedTaxi) + (feeTotalOriginalTruck - feeTotalDiscountedTruck); 

    cout << "Item\t\t\t\t" << "Car\t" << "Taxi\t" << "Truck\t" << endl;
    cout << "------------------------------------------------------\n";
    cout << "Original fee\t\t\t" << "RM " << feeOriginalCar << "\t" << "RM " << feeOriginalTaxi << "\t" << "RM " << feeOriginalTruck << endl;
    cout << "Quantity\t\t\t" << qtyVehicleCar << "\t" << qtyVehicleTaxi << "\t" << qtyVehicleTruck << endl;
    cout << "Total original fee\t\t" << "RM " << feeTotalOriginalCar << "\t" << "RM " << feeTotalOriginalTaxi << "\t" << "RM " << feeTotalOriginalTruck << endl;
    cout << "Discount rate\t\t\t" << rateDiscountCar << "%\t" << rateDiscountTaxi << "%\t" << rateDiscountTruck << "%\t" << endl;
    cout << "Total discounted fee\t\t" << "RM " << feeTotalDiscountedCar << "\t" << "RM " << feeTotalDiscountedTaxi << "\t" << "RM " << feeTotalDiscountedTruck << endl;
    cout << "Total after discounted fee\t" << "RM " << feeTotalAfterDiscountedCar << "\t" << "RM " << feeTotalAfterDiscountedTaxi << "\t" << "RM " << feeTotalAfterDiscountedTruck << endl;
    cout << endl;

    /* Displays output */
    cout << "Total original fee\t\t:\t" << "RM " << feeReportTotalOriginalFee << endl;
    cout << "Total discounted fee\t\t:\t" << "RM " << feeReportTotalDiscountedFee << endl;
    cout << "Total after discounted fee\t:\t" << "RM " << feeReportTotalAfterDiscountedFee << endl;
    cout << endl << endl;

    /* Displays end line */
    cout << "------------------- End of Program -------------------" << endl;
    system("PAUSE");
    return 0;

    return 0;
}

Answer 1

您似乎没有给feeReportTotalAfterDiscountedFee类型。它的第一次出现似乎是在注释中，它们没有提供任何关于实际上是什么的指示。鉴于代码中其他变量的类型，我假设它是double，但编译器不知道。

尝试将double放在第一条注释行的feeReportTotalAfterDiscountedFee前面（当然，在取消注释后）。

如何解决“未声明的标识符”错误？

1 个答案: