在我的程序中，我试图从Main调用void函数，但我无法找出正确的方法。
Main位于最底层，void GetTicketType(char &Choice)是我需要调用cout故障单类型的函数。
//---------------------------------------------------------------------------
// Purpose: This program simulates a ticket office for sporting events
// Author: TBA
// Date: TBA
//---------------------------------------------------------------------------
#include <iostream>
#include <iomanip>
using namespace std;
const char CASH = 'C';
const char CREDIT = 'D';
const char NOSEBLEED = 'N';
const char BOX_SEAT = 'B';
const char FIFTY_YARD_LINE = 'F';
const char STUDENT_SECTION = 'S';
const float NOSEBLEED_PRICE = 43.42;
const float BOX_SEAT_PRICE = 353.85;
const float FIFTY_YARD_LINE_PRICE = 94.05;
const float STUDENT_SECTION_PRICE = 19.99;
//---------------------------------------------------------------
// Function: ConfirmChoice
// Purpose: Confirms the users ticket purchase before processing payment
// Parameters: TicketType - The type of ticket selected
// Returns: true if the user confirms the selection, false otherwise
//--------------------------------------------------------------
bool ConfirmChoice(const char TicketType)
{
char Choice;
bool Confirmed;
// Print out their selection
cout << "\nYou have chosen to purchase ";
cout << fixed << setprecision(2);
switch (TicketType)
{
case NOSEBLEED:
cout << "Nosebleed ticket(s) at a price of $";
cout << NOSEBLEED_PRICE << ".\n";
break;
case BOX_SEAT:
cout << "Box Seat ticket(s) at a price of $";
cout << BOX_SEAT_PRICE << ".\n";
break;
case FIFTY_YARD_LINE:
cout << "Ticket(s) on the 50 yard line at a price of $";
cout << FIFTY_YARD_LINE_PRICE << ".\n";
break;
case STUDENT_SECTION:
cout << "Ticket(s) in the Student Section at a price of $";
cout << STUDENT_SECTION_PRICE << ".\n";
break;
}
// Confirm the selection
cout << "Do you wish to confirm your purchase? Enter Y or N: ";
cin >> Choice;
Choice = toupper(Choice);
while (Choice != 'Y' && Choice != 'N')
{
cout << "Invalid selection. Please enter either Y or N: ";
cin >> Choice;
Choice = toupper(Choice);
}
Confirmed = (Choice == 'Y');
// Check confirmation
if (Confirmed)
cout << "You have confirmed your choice.\n" << endl;
else
cout << "You not confirmed your choice.\n" << endl;
return (Confirmed);
}
//-------------------------------------------
// Function: CalculateChange
// Purpose: To output the change due
// Parameters: ChangeDue - The amount of change needed
// Returns: Nothing
//-------------------------------------------
void CalculateChange(const float ChangeDue)
{
int Change = 0;
int Dollars = 0;
int Quarters = 0;
int Dimes = 0;
int Nickels = 0;
int Pennies = 0;
// Compute change
Change = ChangeDue * 100;
Dollars = Change / 100;
Change = Change % 100;
Quarters = Change / 25;
Change = Change % 25;
Dimes = Change / 10;
Change = Change % 10;
Nickels = Change / 5;
Pennies = Change % 5;
// Print out change
cout << "Your change is \n\t";
cout << Dollars << " Dollars\n\t";
cout << Quarters << " Quarters\n\t";
cout << Dimes << " Dimes\n\t";
cout << Nickels << " Nickels\n\t";
cout << Pennies << " Pennies\n";
}
//---------------------------------------------------------------------------
// Function: CalculateCost
// Purpose: Calculate the cost of the ticket purchase(s) (num_tickets * price_per_ticket)
// Parameters: PricePerTicket - Ticket price based on the type of ticket
// Returns: The cost of purchasing the chosen number of tickets
//---------------------------------------------------------------------------
float CalculateCost(const float PricePerTicket)
{
int TicketCount;
float Cost;
cout << "How many tickets would you like? Please enter a positive integer value: ";
cin >> TicketCount;
while (TicketCount < 0)
{
cout << "Invalid entry. Please re-enter: ";
cin >> TicketCount;
}
Cost = PricePerTicket * TicketCount;
cout << "Your bill is: $" << fixed << setprecision(2) << Cost << endl;
return Cost;
}
//---------------------------------------------------------------------------
// Function: GetPaymentType
// Purpose: Ask the user how they want to pay, cash or credit
// Parameters: None
// Returns: Value is CREDIT or CASH (global character constants)
//---------------------------------------------------------------------------
char GetPaymentType()
{
char Choice;
// Print the main menu describing the ticket payment types
cout << "+-------------------------------------------------------+\n";
cout << "+ Welcome to our Ticket Office +\n";
cout << "+-------------------------------------------------------+\n";
cout << endl << endl;
// Cash or credit card (in upper case)
cout << "How would you like to pay?\n";
cout << "Enter C for cash or D for credit card: ";
cin >> Choice;
Choice = toupper(Choice);
while (Choice != CASH && Choice != CREDIT)
{
cout << "Invalid choice. Please enter C for cash or D for credit card: ";
cin >> Choice;
Choice = toupper(Choice);
}
return Choice;
}
//---------------------------------------------------------------------------
// Function: GetTicketType
// Purpose: Get the customer's choice between 4 types of tickets
// Parameters: Choice - Set to the user's choice
// Returns: Nothing
//---------------------------------------------------------------------------
void GetTicketType(char &Choice)
{
// Ask the customer what type of ticket s/he prefers to buy
cout << "\nWhat type of ticket would you like?\n";
cout << "\t" << NOSEBLEED << " for Nosebleed Section, Price = $";
cout << NOSEBLEED_PRICE << endl;
cout << "\t" << BOX_SEAT << " for Box Seats, Price = $";
cout << BOX_SEAT_PRICE << endl;
cout << "\t" << FIFTY_YARD_LINE << " for Seats on the Fifty Yard Line, Price = $";
cout << FIFTY_YARD_LINE_PRICE << endl;
cout << "\t" << STUDENT_SECTION << " for Student Section, Price = $";
cout << STUDENT_SECTION_PRICE << endl;
// Get ticket choice (in upper case)
cout << "Enter choice: ";
cin >> Choice;
Choice = toupper(Choice);
while (Choice != NOSEBLEED && Choice != BOX_SEAT &&
Choice != FIFTY_YARD_LINE && Choice != STUDENT_SECTION)
{
cout << "Invalid choice. Please re-enter: ";
cin >> Choice;
Choice = toupper(Choice);
}
}
//---------------------------------------------------------------------------
// Function: PayWithCash
// Purpose: Handles payment by cash. Asks the user for the money until
// they enter enough, then updates the ChangeDue parameter
// Parameters: Cost - The amount due for the purchase
// ChangeDue - The amount of change due to customer
// Returns: Nothing
//---------------------------------------------------------------------------
void PayWithCash(const float Cost, float &ChangeDue)
{
float CashOffered;
// Pay in cash
cout << "Please enter enough cash. Your bill is $" << Cost << ": $ ";
cin >> CashOffered;
// Check sufficiency
while (CashOffered < Cost)
{
cout << "That is not enough to pay for your purchase!\n"
<< " Please enter at least $" << Cost << ": ";
cin >> CashOffered;
}
// Calculate change
ChangeDue = CashOffered - Cost;
}
//---------------------------------------------------------------------------
// Function: PayWithCredit
// Purpose: Handles payment by credit. Basically, just prints a statement
// telling them that their card will be charged.
// Parameters: const float Cost - the amount due for the purchase
// Returns: Nothing
//---------------------------------------------------------------------------
void PayWithCredit(const float Cost)
{
cout << "Your credit card will be billed for $" << Cost << ".\n";
}
//---------------------------------------------------------------------------
// Function: main
// Purpose: This is the main program that calls functions above.
// Parameters: None
// Returns: Nothing
//---------------------------------------------------------------------------
int main()
{
// Declarations
char TChoice ; // Ticket type: Nosebleed, box seats etc..
TChoice << GetTicketType( &TChoice);
char PChoice = GetPaymentType() ; // Payment choice: cash or credit card
bool Confirmed; // Did the user confirm the selection
float Cost; // The cost of the ticket puchased
float ChangeDue; // The amount of change owed (for cash purchases)
// Print your name and UAID
// Get the choice of payment type
// Get the choice of ticket type
GetTicketType(TChoice );
{
cout << "You have chosen the " << TChoice << "tickets. " <<".\n";
}
// Confirm the selection
// If they confirm the purchase
// Call functions to figure out the price of ticket purchase(s)
// Be sure to use the named constants
// Handle the payment
// Say goodbye
// Else
// Cancel the purchase
return 0;
}
答案 0 :(得分：2)
更改
TChoice << GetTicketType( &TChoice);
简单
GetTicketType( &TChoice);
由于TChoice << GetTicketType( &TChoice);正在执行bitwise left shift operation，它将在<<之后期望一个整数类型。您的函数没有返回任何内容（void），从而导致错误。
答案 1 :(得分：1)
看起来你在这一行上收到错误：
TChoice << GetTicketType( &TChoice);
您正在调用GetTicketType并希望使用结果。这真的是你想要做的，因为它是void函数吗？