Question

这是我的bankMenu的代码，我一直收到这个错误，我已经尽我所知来尝试解决这个问题，但无济于事......有什么建议吗？

bool bankingMenu(bool menuFlag)  //banking menu 
{

    char choice;
    bool flag = false;
    bool flag2 = menuFlag;
    //print login menu
    cout<<"\n";
    cout<<"\n";
    cout<<" BANK MENU"<<endl;
    cout<<"----------------------------------------------------------------------"<<endl;
    cout<<endl;
    cout<<" A. SHOW ACCOUNT BALANCE"<<endl;
    cout<<" C. MAKE A WITHDRAWAL"<<endl;
    cout<<" D. WRITE A CHECK"<<endl;
    cout<<" E. SHOW ALL TRANSACTIONS"<<endl;
    cout<<" F. LOGOFF ACCOUNT"<<endl;

    cout<<"\n";
    cout<<"\n";
    cout<<"PLEASE ENTER YOUR SELECTION"<<endl;
    //enter choice of action
    cin>> choice;
    //change input to uppercase
    choice = toupper(choice);
    //input validation for choice
    while( flag == false)
    {
        if(choice != 'A' && choice != 'B' && choice != 'C' && choice!= 'D' && choice!= 'E' && choice!= 'F')
        {
            cout<<"\n";
            cout<<"\n";
            cout<<"ERROR!! YOU HAVE ENTERED AN INVALID CHOICE. PLEASE ENTER A VALID OPTION."<<endl;
            cin>> choice;
            //change input to uppercase
            choice = toupper(choice);
            continue;
        }
        flag=true;
    }
    //switch for action to be taken with the choice value
    switch (choice)
    {
    case 'A' : cout<< "YOU HAVE ENTERED A. \n";
        break;
    case 'B' : cout<< "YOU HAVE ENTERED B. \n";
        break;
    case 'C' : cout<< "YOU HAVE ENTERED C. \n";
        break;
    case 'D' : cout<< "YOU HAVE ENTERED D. \n";
        break;
    case 'E' : cout<< "YOU HAVE ENTERED E. \n";
        break;
    case 'F' : flag2= false;
        //returns to the login menu
        return flag2;
        break;
    default: ;
    }}

我该如何修复此错误？

Answer 1

首先，这是一个警告，而不是错误。您的代码将编译并运行，但警告是编译器说“这可能不会按照您的想法执行！您可能需要仔细检查它！”

它说“并非所有控制路径返回值”的原因是你的函数并不总是返回任何东西。具体来说，只有输入'F'才会返回任何内容。要修复它，让你的函数总是返回一些东西。

Answer 2

在方法结尾处添加return flag2;（或true或false）以确保您具有返回值，即使选项不是“F”。

警告C4715：'bankingMenu'：并非所有控制路径都返回一个值（C ++）

2 个答案: