Can someone help me find why an indirectly related global variable is affecting if statement result?

Testing Environment: Microsoft Visual Studio 2010 Ultimate.

What my if statement is suppose to do:

1. user makes a deposit OR withdraw----return 1 transaction
2. user makes a deposit AND withdraw----return 2 transactions
3. user does NOT make a deposit or withdraw----return 0 transactions.

My if statement half works. The reason I believe its wonky is because of my "inital balance" and my "new balance" couts that are using the global variable BALANCE.

The reason I feel like balance isn't directly related to the if statement is because only the Deposit amount (function DepositAmt) and Withdraw amount (function WithdrawAmt) should be directly affected by balance.

I went through the main.cpp and I've tried rearranging order of code and it's not making a difference. I'm completely stumped.

**Main.cpp**


    int main()
    {
        char firstName[255];
        char lastName[255];
        char sinNumber[255];
        double balance = 0;
        int accountType = 0;
        int transactions = 0;

        //Retrieve client information
     ...
        cout << "Enter initial balance: ";
        cin >> balance;

        //Creating the account
        Account account(firstName, lastName, sinNumber, balance, accountType, transactions);

        double deposit;
        double withdraw;
        double amount;
        double ammount;
        int transaction;

        cout << "Amount to deposit:     ";
        cin >> amount;
        deposit = account.DepositAmt(amount);
        cout << "Your new balance is:   " << deposit << endl;
        cout << "Amount to withdraw:    ";
        cin >> ammount;
        withdraw = account.WithdrawAmt(ammount);
        if (deposit >= 1 && withdraw >=1)
        {
           transactions = transactions + 2;

        }
        else if (deposit >= 1 || withdraw >=1)
        {
            transactions = transactions + 1;

        }
        else
        {

        };
        cout << "Your new balance is:   " << withdraw << endl;
        cout << "Transactions:  " << transactions << endl;

    }


***account.cpp***

    #include "account.h"

    //Initializing account entities
    Account::Account(char fn[], char ln[], char sin[], double bal, int actype, int trans)
    {
        strcpy(firstName, fn);
        strcpy(lastName, ln);
        strcpy(sinNumber, sin);
        balance = bal;
        accountType = actype;
        transactions = 0;
    };


    //Deposit amount to account of user, will return the balance
    double Account::DepositAmt(double amount) 
    {
        if (amount < 0)
        {
            cout << "You cannot deposit a negative balance!" << endl;
            return -1;
        }

        //the initial balance will be added to the amount deposited
        balance = balance + amount;

        return balance;

    };

    //Withdrawal amount from account of user
    double Account::WithdrawAmt(double withdrawal)
    {

        //Withdraw more than balance, cause error
        if (withdrawal > balance)
        {

            cout << "Sorry the withdrawal amount exceeds the account balance" <<endl;
            return balance;
        }

        //withdrawal will deduct from the current balance.
        balance = balance - withdrawal;

        return balance;

    };

Test Scenarios :

(access to full code :

http://ift.tt/1LBc6om account.h

http://ift.tt/1zdFJFo account.cpp

http://ift.tt/1zdFJFq main.cpp )

Thank you.