卡住請幫助。空白未定義標識符

Question

我一直堅持這個程序，我已經創建了一段時間，現在在這個問題上。沒有人真的能夠幫助我。我只想知道如何獲得無效的工作，因爲裏面的變量不能被定義。

void PoorRating(Questionnaire RatingDetails[], int i){ 
    for(i=0;i<100;i++){ 
     if(RatingDetails[i].Rating >=1 && RatingDetails[i].Rating <=3){ 
     } 
     cout << "Information: " << endl << "Name: " << Customer[i].Title << " " << Customer[i].Surname; 
    } 
} 

---

int main(){ 
    char AnotherQ; 
    int largestgroup; 
    Questionnaire Customer[100];//set an array 
    int i=0; 
    do{ 
     cout << "Please enter Customer title: "; cin >> Customer[i].Title; 
     cout << "Please enter Customer surname: ";cin >> Customer[i].Surname; 
     cout << "Please Enter Telephone: "; cin >> Customer[i].Telephone;//set to college the customer's telephone number 
     Customer[i].Telephone=ValidateTelephone(Customer,i); //Continues to ValidateTelehpone number operation 
     cout << "Please Enter Group Size: "; cin >> Customer[i].Groupsize; 
     Customer[i].Groupsize=ValidateGroupSize(Customer,i);//Continues to ValidateGroupSize number operation 
     cout << "Please Enter Rating of meal: "; cin >> Customer[i].Rating; 
     Customer[i].Rating=ValidateRating(Customer,i);//Continues to ValidateRating operation 
     cout<<"Do you want to Continue(y/n)? "; cin>>AnotherQ;//Asks if user wants to continue or end program 
     i++; 
    } while(AnotherQ=='y' || AnotherQ=='Y'); 

    largestgroup=FindingLargestGroup(Customer, i); 
     cout << "Largest Group: " << largestgroup << endl;//displays information 

    CounterRating(Customer ,i); 
    PoorRating(Customer,i); 

    system("pause"); 
    return 0; 
} 

Answer 1

如果我編譯代碼上ideone with GCC 4.3.2，我收到以下錯誤信息：

prog.cpp: In function 'void PoorRating(Questionnaire*, int)': 
prog.cpp:68: error: 'Customer' was not declared in this scope 
prog.cpp: In function 'int main()': 
prog.cpp:97: error: 'system' was not declared in this scope 

在你的方法

void PoorRating(Questionnaire RatingDetails[], int i){ 
    for(i=0;i<100;i++){ 
     if(RatingDetails[i].Rating >=1 && RatingDetails[i].Rating <=3) { 

     } 
    cout << "Information: " << endl 
     << "Name: " << Customer[i].Title << " " << Customer[i].Surname; 
    } 
} 

你想參考到Customer變量，它在main()中聲明。你可能意思是RatingDetails。

至於失蹤system()聲明，包括<stdlib.h>。

code compiles修復了上述問題。

編輯：
另外請注意，你可能是指有「評爲」的if()語句塊內的輸出，並省略for()循環都：

void PoorRating(Questionnaire RatingDetails[], int i){ 
    if(RatingDetails[i].Rating >=1 && RatingDetails[i].Rating <=3) { 
     cout << "Information: " << endl 
      << "Name: " << RatingDetails[i].Title << " " << RatingDetails[i].Surname; 
    } 
}