object in if block problem

[new_developer]

Hi everyone,

I am stuck in writing Bank Account program. I want that if user wants to create an account, BankAccount class object is created. Then after this i call to its methods such as getBalance() to get the balance in the account. But its not working and I am getting error.

#include <iostream>
#include <string>

class BankAccount
{
    protected:
        double balance;

    public:
        BankAccount()
        {
            balance = 0.0;
        }

        BankAccount(double b)
        {
            balance = b;    
        }

        double getBalance()
        {
            return balance;
        }
};

int main()
{

    string input;
    double bal;

    cout <<"Do you want to create an account ??"<<endl;
    cin >> input;

    if(input == "y")
    {
        cout <<"\nYour account has been created !"<<endl;
        cout <<"Specify your amount to deposite :"<<endl;
        cin >> bal;

        BankAccount b1(bal);
    }

    cout <<"Your initial balance is : "<<b1.getBalance() <<"."<<endl; //line of error


return 0;
}

Error is undefined symbol b1. Please help to resolve this error but I need the same logic by asking user to create account in main, Thanks.

[nullptr]

The simple reason for the error is that the scope in which BankAccount b1 is valid, ends with the closure of your if (input == "y") block.

Here's your code with a few minor alterations.

class BankAccount
{
    protected:
        double balance;

    public:
        BankAccount()
        {
            balance = 0.0;
        }

        BankAccount(double b)
        {
            balance = b;
        }

        void Deposit(double b)
        {
            balance += b;    
        }

        double getBalance()
        {
            return balance;
        }
};

int main()
{
    BankAccount b1; // default constructor called
    string input;
    double bal;

    cout <<"Do you want to create an account (y/n) ?"<<endl;
    cin >> input;

    if(input == "y")
    {
        cout <<"\nYour account has been created !"<<endl;
        cout <<"Specify your amount to deposit :"<<endl;
        cin >> bal;

        b1.Deposit(bal);
        cout << "Your initial balance is : "<< b1.getBalance() << "." << endl;
    }
    cin.ignore(90, '\n');
    getchar();

    return 0;
}

I'll leave it to you to handle the precision of the displayed double variables. What happens if I deposit or open an account with a negative amount of money? It's a good idea to validate any user input, so take that into consideration when you're coding.