Question

我想让用户编辑txt文件而ItemID是一个唯一的字符，我想检查系统中是否存在类似ItemID中的用户密钥，会出现错误。

但在我通过键入已存在的Item ID进行测试后，它成功提示“ItemID已存在于stock数据库中” 但是当我试图键入系统中不存在的另一个ItemID时，没有任何反应，它不会显示“返回主菜单”或退出到主菜单。

请告知

    switch (choice) {
        case 1:

        while (true)
        {
            if (duplicate == true)
                {
                    system("clear");
                    cout << "\E[1;32m" <<itemID << "\E[0m already exists in the stock database!" << endl;
                    cout << "Please enter a unique Item ID that is not used yet" << endl;

                cout << "\E[1;32mItem ID:\E[0m\t" << stockVectorTemp[vectorChoice - 1].getItemID() << endl;
                cout << "\E[1;32mDescription:\E[0m\t" << stockVectorTemp[vectorChoice - 1].getItemDesc() << endl;
                cout << "\E[1;32mTotal Quantity:\E[0m\t" << stockVectorTemp[vectorChoice - 1].getTotalQty() << endl << endl;

                     }
                     duplicate = false;

             cout << logo_EditStock << endl;
                     cout << "Please enter new ItemID: ";
                     getline(cin, input);

             for (int i = 0; i < stockVector.size(); i++) 
             {
                if (stockVector[i].getItemID() == itemID)
                    stockVector[i].setItemID(input);

                                duplicate = true;
                    writeStockDatabase();
                 //  cout << "Returning to main menu..." << endl << endl;
                     }
                    if (!duplicate)

                     break;
        }

        cout << "Returning to main menu..." << endl << endl;

中断;

Answer 1

你忘记了if()陈述的开头大括号。正如评论所指出的那样，您应该改进格式：

for (int i = 0; i < stockVector.size(); i++)
{
    if (stockVector[i].getItemID() == itemID)
    {
        stockVector[i].setItemID(input);
        duplicate = true;
        writeStockDatabase();
        //  cout << "Returning to main menu..." << endl << endl;
    }
    if (!duplicate)
        break;
}

用户编辑C ++后覆盖.txt文件

1 个答案: