Question

我在这里使用的代码非常不错，除非我们开始使用＆＃39; processData＆＃39;函数我收到错误

＆＃34;变量＆＃39; totalPay＆＃39;正在使用而未被初始化。＆＃34;

我已经在这个工作了几个小时，我的大脑麻木了，任何帮助都会受到赞赏。

#include <iostream>
#include <string>
#include <climits>
#include <iomanip>
using namespace std;

// Prototypes
int readInt(string errorMsg = "", int min = INT_MIN, int max = INT_MAX);
void getData(string&, int&, char&, double&);
char getChoice(string prompt, char char1, char char2);
double processData(char service);
void display(string, int, char, double);


// Regular service
const double RCHARGE = 10.00;        // Regular service base rate for first REG_MINS.
const double RPERMIN = 0.20;         // Regular service cost per minute over REG_MINUTES.
const int REG_MINS = 50;             // Regular service free minutes.
// Premium service
const double PCHARGE = 25.00;        // Minimum charge for premium service.
const double P_PER_MIN_DAY = 0.10;   // Charge per day minutes after 75.
const double P_PER_MIN_NIGHT = 0.05; // Charge per night minutes after 100.
const int P_DAY = 75;                // Number of free minutes allowed during the day.
const int P_NIGHT = 100;             // Number of free minutes allowed during the night.

int main()
{
    string name;        // Stores the users name.
    int accountNumber;  // Stores the users account number.
    char serviceType;   // Stores the users service type.
    double minutes;     // Stores the users minutes.
    double totalPay;    // Recieves the total pay from processData.
    bool loopies = true;// Controls the loop while condition is true.


    while (loopies == true)
    {
        getData(name, accountNumber, serviceType, minutes);

        totalPay = processData(serviceType);

        display(name, accountNumber, serviceType, totalPay);
    }



    return 0;
}
// Checks ints to make sure they are valid.
int readInt(string errorMsg, int min, int max)
{
    int someInt;
    bool valid = false;

    do
    {
        // User entering account number
        cin >> someInt;

        // Verifying the data is valid (0 to 9999)
        valid = (someInt >= min && someInt <= max);

        // Clearing out invalid data and prompting for re-entry
        if (cin.fail() || !valid || !isspace(cin.peek()))
        {
            cout << "Error! Invalid input." << endl;
            cout << errorMsg << " must be whole number between " << min << " and " << max << endl;
            cout << "Try Again: ";
            cin.clear(); // Clearing the fail state
            cin.ignore(numeric_limits<streamsize>::max(), '\n');

            valid = false;
        }
    } while (!valid);

    // Clears out following incorrect data once correct
    cin.ignore(100, '\n');

    return someInt;
}
// Takes all user data and checks input.
void getData(string &name, int &account, char &service, double &bill)
{

    cout << "Enter customer name or \"Exit\" to end program: ";
    getline(cin, name);

    if (name == "Exit" || name == "EXIT" || name == "exit")
    {
        cout << "Program closing..." << endl;
        system("pause");
        exit(EXIT_SUCCESS);
    }

    cout << "Enter account number: ";
    account = readInt("Account", 0, 10000);

    cout << "Enter service type (R for regular or P for premium): ";
    service = getChoice("Service", 'r', 'p' );

}

char getChoice(string input, char char1, char char2)
{
    char character;     // Stores the users character.
    bool valid = false; // Controls the loop.

    do
    {


        cin >> character;
        character = tolower(character);


        valid = (character == char1 || character == char2);


        if (!valid || !isspace(cin.peek())) {
            cout << "Invalid input!" << endl;
            cout << input << " needs to be " << char1 << " or " << char2 << endl;
            cout << "Try again: ";
            cin.clear();
            cin.ignore(numeric_limits<streamsize>::max(), '\n');

            valid = false;
        }
    } while (!valid);

    cin.ignore(100, '\n');

    return toupper(character);
}

double processData(char service)
{
    int dayMin;      // Stores the users day minutes.
    int nightMin;    // Stores the users night minutes.
    double totalPay; // Stores the total pay.
    double dayPay;   // Stores the pay for day minutes.
    double nightPay; // Stores the pay for night minutes.

    if (service == 'r')
    {
        cout << "Enter minutes used: ";
        cin >> dayMin;
        dayMin = readInt("Minutes ", 0, INT_MAX);

        if (dayMin > REG_MINS)
        {
            dayMin -= REG_MINS;
            totalPay = (dayMin * RPERMIN) + RCHARGE;
        }
        else
        {
            totalPay = RCHARGE;
        }
        totalPay = nightPay + dayPay - RCHARGE;
    }
    else if (service == 'p')
    {
        cout << "Enter day minutes: ";
        cin >> dayMin;
        dayMin = readInt("Minutes ", 0, INT_MAX);

        if (dayMin > P_DAY)
        {
            dayMin -= P_DAY;
            dayPay = (dayMin * P_PER_MIN_DAY) + PCHARGE;
        }
        else
        {
            dayPay = PCHARGE;
        }

        cout << "Enter night minutes: ";
        cin >> nightMin;
        nightMin = readInt("Minutes ", 0, INT_MAX);

        if (nightMin > P_NIGHT)
        {
            nightMin -= P_NIGHT;
            nightPay = (nightMin * P_PER_MIN_NIGHT) + PCHARGE;
        }
        else
        {
            nightPay = PCHARGE;
        }

    }
    return totalPay;
}

void display(string name, int account, char service, double bill)
{
    string switchService;

    switch (service)
    {
    case 'R':
        switchService = "Regular";
        break;
    case 'P':
        switchService = "Premium";
        break;
    default:
        cout << "Invalid character.";
    }

    cout << fixed << setprecision(2);

    cout << endl;
    cout << "Customer Name: " << name << endl;
    cout << "Account number: " << account << endl;
    cout << "Service type: " << switchService << endl;
    cout << "Amount due: $" << bill << endl << endl;

}

Answer 1

在processData()中，如果service既不是p也不是r，则在返回之前永远不会分配totalPay。

您可以在声明中初始化它，如

double totalPay = 0.0;

使用未初始化的变量

1 个答案: