Question

首先，我非常喜欢编程。当我运行代码并通过我的案例1切换时，我的问题出在我的main.cpp文件中。我希望我的程序在完成购物后打印出客户的姓名和地址。＆＃34; myCustomerInfo.getName（）＆＃34;和＆＃34; myCustomerInfo.getAddress（）＆＃34;没有做任何事情。我的导师整个星期一直都是MIA，没有任何帮助。我做错了什么？

//这是我的班级

#pragma once
#include <string> 
using namespace std;

class CustomerInfo
{
private:
    string custName;
    string custAddress;
public:

    CustomerInfo(string name, string userAddress) : custName(name), custAddress(userAddress) {}
    void setName(string);
    void setAddress(string);
    string getName();
    string getAddress();
    CustomerInfo();
};

// Defining setName
void CustomerInfo::setName(string name) {
    custName = name;
}
// Defining setAddress
void CustomerInfo::setAddress(string userAddress) {
    custAddress = userAddress;
}
// Defining getName
string CustomerInfo::getName() {
    return custName;
}
// Defining getAddress
string CustomerInfo::getAddress() {`enter code here`
    return custAddress;
}

//课程结束

//这是我的main.cpp

#include <iostream>
#include <Windows.h>
#include <cstdlib>
#include <string>
#include "customerclass.h"
using namespace std;


//***** Functions to calculate the price of multiple items *****
void finalPrice1(int itemQuantity) {
    float price;
    price = itemQuantity * 3.00;
    cout << "Your total is $" << price << endl;
    cout << "Thank you for using my shop" << endl;
    exit(0);
}
void finalPrice2(int itemQuantity) {
    float price;
    price = itemQuantity * 2.50;
    cout << "Your total is $" << price << endl;
    cout << "Thank you for using my shop" << endl;
    exit(0);
}
void finalPrice3(int itemQuantity) {
    float price;
    price = itemQuantity * 1.25;
    cout << "Your total is $" << price << endl;
    cout << "Thank you for using my shop" << endl;
    exit(0);
}   //***** End of functions that calculate price of multiple items *****




int main(void)
{
    char selection = ' ';
    string lname = "";
    string luserAddress;
    int itemQuantity;
    string orderFinalized;
    CustomerInfo myCustomerInfo;

    myCustomerInfo.setName(lname);
    myCustomerInfo.setAddress(luserAddress);



    do
    {  // Displaying menu
        cout << "Hello, welcome to my online shop! What is your name? " << endl;
        cout << " And what is your shipping address? " << endl;
        cin >> lname >> luserAddress;

        cout <<  lname + ", nice to meet you. Here are the items in my shop followed by the price, please enter the number that corresponds to the item you want. \n " << endl;



        cout << "Products \n";
        cout << "1 - Chocolate candy bar - $3.00" << endl;
        cout << "2 - Sour hard candy - $2.50" << endl;
        cout << "3 - Mints - $1.25" << endl;
        cout << "4 - Exit" << endl << endl;
        cout << "Enter selection ";
        // Reading User Selection
        cin >> selection;
        switch (selection)
        {
        case '1':
            cout << "You've chosen a Chocolate candy bar. How many would you like? ";
            cin >> itemQuantity;
            cout << "Ok, will this finalize your order? Type and enter either 'Yes' or 'No' " << endl;
            cin >> orderFinalized;
            if (orderFinalized == "Yes" || "yes" || "YES") {
                cout << myCustomerInfo.getName() + " your items will be shipped to " << myCustomerInfo.getAddress() << endl;
                cout << "Printing your receipt now..." << endl;
                finalPrice1(itemQuantity);
            }
            else if (orderFinalized == "No" || "no" || "NO") {

            }

            break;
        case '2':
            cout << "You've chosen Sour hard candy. How many would you like? ";
            cin >> itemQuantity;
            cout << "Ok, will this finalize your order? Type and enter either 'Yes' or 'No' " << endl;
            cin >> orderFinalized;
            if (orderFinalized == "Yes" || "yes" || "YES") {
                finalPrice2(itemQuantity);
                cout << "What's the address your items will be shipped to? " << endl;
                cin >> luserAddress;
                cout << "Ok, your order will be shipped to " << luserAddress << endl;
            }
            break;
        case '3':
            cout << "You've chosen Mints. How many would you like? ";
            cin >> itemQuantity;
            cout << "Ok, will this finalize your order? Type and enter either 'Yes' or 'No' " << endl;
            cin >> orderFinalized;
            if (orderFinalized == "Yes" || "yes" || "YES") {
                finalPrice3(itemQuantity);
                cout << "What's the address your items will be shipped to? " << endl;
                cin >> luserAddress;
                cout << "Ok, your order will be shipped to " << luserAddress << endl;
            }
            break;
        case '4':
            cout << "Thank you for using my shop. <exiting now...>" << endl;
            break;

        default: cout << "Invalid selection. Please try again";
        }
        cout << endl << endl;
    } while (selection != '4');
    return 0;
}

Answer 1

仔细查看您的代码：

string lname = "";
string luserAddress;
int itemQuantity;
string orderFinalized;
CustomerInfo myCustomerInfo;

myCustomerInfo.setName(lname);

因为此时您将名称设置为""。您需要在更新lname。

后进行设置

很少有其他事情。改变了这个：

if (orderFinalized == "Yes" || "yes" || "YES")

到此：

if (orderFinalized == "Yes" || orderFinalized == "yes" || orderFinalized == "YES")

你有多个地方。同样适用于“不”。

[编辑]：@ user4581301建议的更优雅的方法是将字符串转换为小写字母，只进行一次比较：

std::transform(orderFinalized.begin(), orderFinalized.end(), orderFinalized.begin(), ::tolower);
if (orderFinalized == "yes"){
    // the rest of the code
}

Answer 2

orderFinalized == "Yes" || "yes" || "YES"应为orderFinalized == "Yes" || orderFinalized == "yes" || orderFinalized == "YES"

在c ++中我的类的set / get方法有问题

2 个答案: