双函数不返回任何内容
Double Function Not Returning Anything
#include <iostream>
using namespace std;
void userBalance(double balance1, double balance2);
//Displays the account balance for both the accounts and also a message that a service charge will be imposed for every
//transaction if balance is less than the minimum balance and also suggests the user to deposit money in the account.
void deposit(double& balance, double amount);
//Adds the amount of deposit and displays the new balance to user
void paybill(double& balance, double amount, int accountType);
//Checks it there are sufficient funds by calling the checkBalance() function. If it returns false, print that transaction
//cannot be completed, try again and display the main menu. If it returns true, deduct the amount from the balance and
// print a message of successful payment. Call the serviceCharge() function for any applicable service charges.
void transfer(double &balance1, double &balance2, double amount, int accountType);
// Check for sufficient funds before allowing this transaction by calling the checkBalance() function. If it returns true,
// then change the savings and checking account balances accordingly and print a message for a successful transfer. Call
// the serviceCharge() function with appropriate arguments to check for any applicable charges on the from account.
//Update and display the final balances
void miniStatement();
//Just prints a message to screen that a statement will be mailed to the registered email. This function will not display any
//actual transactions
double serviceCharge(double balance, int accountType);
//Checks the existing balance and applies the pre-determined service charge if the balance is less than the minimum
//balance for every transaction. This function should print the service charge being applied and return the amount of the
//service charge
bool checkBalance(double balance, double amount);
// Checks if the user can make a transfer/transaction based on the amount entered. The function should return true if the
// balance is more than the transaction amount and false if the balance is less than the transaction amount
int main()
{
bool default = false;
string x;
int choice = 0;
int account_type;
double checking_deposit, savings_deposit;
double checking_balance = 0.0, savings_balance = 0.0;
double bill_amount;
double transfer_amount;
while (choice != 6)
{//happy
cout << "------------------------------------------" << endl;
cout << "Welcome to Jayhawk online banking Services" << endl;
cout << "------------------------------------------" << endl;
cout << "You can use the following features for your account- " << endl;
cout << "1. View account balancen2. Deposit money into an accountn3. Pay online Bills.n4. Transfer funds between savings and checking accountsn5. Send a mini-statement of his accountn6. Exit the programn";
cout << "Please enter a choice: " << endl;
cin >> choice;
switch (choice)
{
case 1: userBalance(checking_balance, savings_balance);
break;
case 2: cout << "Please enter type of account (0 - Checking, 1 - Savings)" << endl;
cin >> account_type;
switch (account_type)
{
while (default == true)
{
case 0: cout << "Please enter amount: " << endl;
cin >> checking_deposit;
deposit(checking_balance, checking_deposit);
userBalance(checking_balance, savings_balance);
break;
case 1: cout << "Please enter amount: " << endl;
cin >> savings_deposit;
deposit(savings_balance, savings_deposit);
userBalance(checking_balance, savings_balance);
break;
default: cout << "Not a valid selection. Please choose again. " << endl;
break;
}
}
break;
case 3: cout << "Please enter type of account (0 - Checking, 1 - Savings)" << endl;
cin >> account_type;
switch (account_type)
{
case 0: cout << "Enter the amount of bill: " << endl;
cin >> bill_amount;
if (checkBalance(checking_balance, bill_amount))
{
paybill(checking_balance, bill_amount, account_type);
userBalance(checking_balance, savings_balance);
}
else if (!checkBalance(checking_balance, bill_amount))
{
serviceCharge(checking_balance, account_type);
}
break;
case 1: cout << "Enter the amount of bill: " << endl;
cin >> bill_amount;
if (checkBalance(checking_balance, bill_amount))
{
paybill(savings_balance, bill_amount, account_type);
userBalance(checking_balance, savings_balance);
}
else if (!checkBalance(checking_balance, bill_amount))
{
serviceCharge(savings_balance, account_type);
}
break;
default: cout << "Not a valid selection. Please choose again. " << endl;
}
break;
case 4: cout << "Choose the account from which you would like to transfer (0 - Checking, 1 - Savings)" << endl;
cin >> account_type;
switch (account_type)
{
case 0: cout << "Enter the amount to be Transferred: " << endl;
cin >> transfer_amount;
if (checkBalance(checking_balance, transfer_amount))
{
transfer(checking_balance, savings_balance, transfer_amount, account_type);
userBalance(checking_balance, savings_balance);
}
else if (!checkBalance(checking_balance, transfer_amount))
{
transfer(checking_balance, savings_balance, transfer_amount, account_type);
serviceCharge(checking_balance, account_type);
userBalance(checking_balance, savings_balance);
}
break;
case 1: cout << "Enter the amount to be Transferred: " << endl;
cin >> transfer_amount;
if (checkBalance(checking_balance, transfer_amount))
{
transfer(savings_balance, checking_balance, transfer_amount, account_type);
userBalance(checking_balance, savings_balance);
}
else if (!checkBalance(checking_balance, transfer_amount))
{
serviceCharge(savings_balance, account_type);
}
break;
default: cout << "Not a valid selection. Please choose again. " << endl;
break;
}
break;
case 5: cout << miniStatement;
break;
case 6: cout << "Thank you for using Jayhawk banking services. You have been logged out..." << endl;
break;
default: cout << "Not a valid option, you warlock. " << endl;
break;
}
}
system("Pause");
return (0);
}
void userBalance(double balance1, double balance2)
{
double checking_balance = balance1;
double savings_balance = balance2;
if (checking_balance == 0.0 && savings_balance == 0.0)
{
cout << "You do not have any balance in your savings and checking account. Please make a deposit to your accounts. " << endl;
}
else
{
cout << "You have $" << checking_balance << " in your Checking account and $" << savings_balance << " in your Savings account " << endl;
}
}
void deposit(double& balance, double amount)
{
balance = balance + amount;
cout << "One moment please, Scanning the check ............nYour deposit is Successful.." << endl;
}
void paybill(double& balance, double amount, int accountType)
{
balance = balance - amount;
accountType = balance;
cout << "Processing.............nThe Bill payment is Successful " << endl;
}
void transfer(double &balance1, double &balance2, double amount, int accountType)
{
balance1 = balance1 - amount;
balance2 = balance2 + amount;
accountType = balance2;
cout << "Transfer of amount is Successful.." << endl;
}
void miniStatement()
{
cout << "A mini-Statement is being generated and will be sent to your registered e-mail" << endl;
}
double serviceCharge(double balance, int accountType)
{
if (accountType == 0)
{
cout << "A service charge of $25.00 is imposed on your Checking account for dropping below the minimum balance" << endl;
return(balance - 25.0);
}
else if (accountType == 1)
{
cout << "A service charge of $15.00 is imposed on your Savings account for dropping below the minimum balance" << endl;
return(balance - 15.0);
}
}
bool checkBalance(double balance, double amount)
{
if (balance-amount > 500)
{
return(true);
}
else if (balance-amount < 500)
{
return(false);
}
}
好吧，如果余额低于 500 美元，此功能应该对支票账户收取 25 美元的服务费，对储蓄账户收取 15 美元的服务费。假设 main 中的所有内容都在工作(确实如此(...我用这个函数做错了什么？
它不会更新余额。相反，如果是，则不会返回更新的值。
任何帮助/建设性的批评将不胜感激！
谢谢！
如果需要更新传递给函数balance，则应通过引用传递它：
double serviceCharge(double& balance, int accountType)
如果你只需要返回更新的值，你可能应该使用临时变量：
double serviceCharge(double balance, int accountType)
{
double ret_balance = balance;
...
return ret_balance;
}
你应该返回一些东西，以防accountType不是 0 或 1(可能会抛出异常(。
您似乎错过了accountType != 0 && accountType != 1的情况。 试试这个：
double serviceCharge(double& balance, int accountType)
{
if (accountType == 0)
{
balance = balance - 25.00;
cout << "A service charge of $25.00 is imposed on your Checking account for dropping below the minimum balance" << endl;
return(balance);
}
else if (accountType == 1)
{
balance = balance - 15.00;
cout << "A service charge of $15.00 is imposed on your Savings account for dropping below the minimum balance" << endl;
return(balance);
}
return (balance);
}
从不使用从函数返回的值。您可以在四个位置执行此操作：
serviceCharge(checking_balance, account_type);
也许你的意思是：
checking_balance = serviceCharge(checking_balance, account_type);
尽管仅通过引用传递余额而不具有返回类型会更简单。
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