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好的，因此對於我的學校項目，我們基本上製作了一個菜單，其中包含最多20位用戶輸入信息並在需要時進行更改。一切工作正常。但是，我們的任務讓我們檢查郵政編碼和帳戶餘額的整數值輸入。我使用了一個用於ZipCode驗證的do-while循環，直到輸入正數和數字。但是，我得到了一個無法修復的死循環。這是我的代碼。如果你把它放到編譯器中，錯誤在57-68行。每次我輸入一個字母而不是一個整數，我就會得到一個無限循環。但我不明白爲什麼。謝謝！我的程序中的無限循環
#include <iostream>
#include <iomanip>
#include <string>
#include <cstdlib>
using namespace std;
struct Account //Structure to be used throughout
{
string CustomerName;
string CustomerAddress;
string City;
string State;
int ZIPCode;
string Telephone;
int AccountBalance;
string DateOfLastPayment;
};
//function prototypes
void valueChangeFunc(string, Account[], int);//This function will be used in option 2 for editing a certain customer information
int main()
{
Account array[20]; //Array to hold up to 20 customers
int choice; //this will hold which option the user decides to make 1-4
bool flagZip = false; //This will be used later on as a flag for a do-while loop
bool flag = false; //This will be used as a flag for the do-while loop right now
int index = 0; //Index for our customers. This tells how many customers have been entered
do //This do while loop will continue to ask the user what option to do until array fills up with 20 people and 4 is not entered
{
cout << "1. Enter new account information \n" <<endl
<< "2. Change account information \n" << endl
<< "3. Display all account information\n" <<endl
<< "4. Exit the program \n" <<endl;
cin >> choice;
if (choice > 4 || choice <= 0)//If user enters a number bigger than 4 or less then or equal to 0. Error!
cout << "Please enter a number between 1 and 4" << endl;
else if(choice == 1)
{
cout << "CustomerName: ";
cin.ignore();
getline(cin, array[index].CustomerName);
cout << "CustomerAddress ";
getline(cin, array[index].CustomerAddress);
cout << "City: ";
getline(cin, array[index].City);
cout << "State: ";
getline(cin, array[index].State);
do
{
cout << "Zip Code: ";
cin >> array[index].ZIPCode;
cin.ignore();
if (!isdigit(array[index].ZIPCode) && array[index].ZIPCode <= 0)
cout << "Please enter a valid entry " << endl;
else
flagZip = true;
}while(flagZip == false);
cout << "Telephone: ";
getline(cin, array[index].Telephone);
flagZip = false;
do
{
cout << "AccountBalance: ";
cin >> array[index].AccountBalance;
cin.ignore();
if (array[index].AccountBalance <= 0)
cout << "Please enter a valid entry " << endl;
else
flagZip = true;
}while(flagZip == false);
cout << "DateOfLastPayment: ";
getline(cin, array[index].DateOfLastPayment);
cout << "\n\nCustomerName: " << array[index].CustomerName << endl;
cout << "CustomerAddress " << array[index].CustomerAddress <<endl;
cout << "City: " << array[index].City << endl;
cout << "State: " << array[index].State << endl;
cout << "Zip Code: " << array[index].ZIPCode << endl;
cout << "Telephone: " << array[index].Telephone <<endl;
cout << "AccountBalance: " << array[index].AccountBalance << endl;
cout << "DateOfLastPayment: " << array[index].DateOfLastPayment << endl;
cout << "You have entered information for customer number " << index << endl << endl;
index++;
}
else if(choice == 2 && index != 0)
{
int num;
string valueChange;
do
{
cout << " Customer number: ";
cin >> num;
if (num > (index-1) || num < 0)
cout << " There is no customer with that number " << endl;
}while (num > (index-1));
cout << "\n\nCustomer Name: " << array[num].CustomerName << endl;
cout << "Customer Address " << array[num].CustomerAddress <<endl;
cout << "City: " << array[num].City << endl;
cout << "State: " << array[num].State << endl;
cout << "ZIPCode: " << array[num].ZIPCode << endl;
cout << "Telephone: " << array[num].Telephone <<endl;
cout << "Account Balance: " << array[num].AccountBalance << endl;
cout << "Date of last payment: " << array[num].DateOfLastPayment << endl;
cout << "You have requested information for customer number " << num << endl << endl;
cout << "What value do you want to change? (press 4 to change 'Date of last payment') \n";
cin.ignore();
getline(cin,valueChange);
valueChangeFunc(valueChange, array, num);
cout << "\nHere is the new value you entered for " << valueChange << endl;
cout << "\n\nCustomer Name: " << array[num].CustomerName << endl;
cout << "Customer Address " << array[num].CustomerAddress <<endl;
cout << "City: " << array[num].City << endl;
cout << "State: " << array[num].State << endl;
cout << "ZIPCode: " << array[num].ZIPCode << endl;
cout << "Telephone: " << array[num].Telephone <<endl;
cout << "Account Balance: " << array[num].AccountBalance << endl;
cout << "Date of last payment: " << array[num].DateOfLastPayment << endl << endl;
}
else if(choice == 3 && index != 0)
{
int num2;
do
{
cout << "Enter the Customer Number to display information regarding that customer" << endl;
cin >> num2;
if (num2 > (index-1) || num2 < 0)
cout << "That Customer does not exist " <<endl;
}
while(num2 > (index-1));
cout << "\n\nCustomerName: " << array[num2].CustomerName << endl;
cout << "CustomerAddress " << array[num2].CustomerAddress <<endl;
cout << "City: " << array[num2].City << endl;
cout << "State: " << array[num2].State << endl;
cout << "Zip Code: " << array[num2].ZIPCode << endl;
cout << "Telephone: " << array[num2].Telephone <<endl;
cout << "AccountBalance: " << array[num2].AccountBalance << endl;
cout << "DateOfLastPayment: " << array[num2].DateOfLastPayment << endl;
cout << "You have entered information for customer number " << index << endl << endl;
}
else
flag = true;
}while (flag == false);
return 0;
}
void valueChangeFunc(string valueChange2, Account array[], int num)
{
if (valueChange2 == "Customer Name" || valueChange2 == "Customer name" || valueChange2 == "customer Name" || valueChange2 == "customer name")
{
cout << "\nEnter new value for Customer Name: " <<endl;
getline(cin, array[num].CustomerName);
}
if (valueChange2 == "Customer Address" || valueChange2 == "Customer address" || valueChange2 == "customer Address" || valueChange2 == "customer address")
{
cout << "\nEnter new value for Customer Address: " <<endl;
getline(cin, array[num].CustomerAddress);
}
else if(valueChange2 == "city" || valueChange2 == "City")
{
cout << "\nEnter new value for City: " << endl;
getline(cin, array[num].City);
}
else if(valueChange2 == "state" || valueChange2 == "State")
{
cout << "Enter a value for State: " << endl;
getline(cin,array[num].State);
}
else if(valueChange2 == "Zip Code" || valueChange2 == "zip Code" || valueChange2 == "Zip code" || valueChange2 == "zip code")
{
cout << "\nEnter a value for Zip Code: " << endl;
cin >> array[num].ZIPCode;
}
else if(valueChange2 == "telephone" || valueChange2 == "Telephone")
{
cout << "\nEnter a value for Telephone: " << endl;
getline(cin, array[num].Telephone);
}
else if(valueChange2 == "Account Balance" || valueChange2 == "Account balance" || valueChange2 == "account Balance" || valueChange2 == "account balance")
{
cout << "\nEnter a value for account balance: " << endl;
cin >> array[num].AccountBalance;
}
else if(valueChange2 == "4")
{
cout << "\nEnter the value for Date of last payment: " << endl;
getline(cin, array[num].DateOfLastPayment);
}
else
cout << "Not entered correctly. Please enter a valid entry to edit " << endl;
}
再次一切工作，直到我開始使用循環來檢查ZipCode的數字值。當我輸入一個字母時，循環只能是無限的。它適用於負數和正數。
調試器可以在幾秒鐘內爲您找到它。值得學習使用它的時間。 – user4581301
gcc 5.3編譯這段代碼時沒有任何錯誤。如果您不理解編譯器的錯誤消息，除了發佈代碼之外，還應該包含來自編譯器的實際錯誤。 –
編譯器沒有錯誤。當我在ZipCode部分輸入一個字母時，只是一個無限循環。 –