C++ Game Dev -> Bank Account Simulator

Bank Account Simulator

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Stenny

Posted: May 27 2006, 01:46 PM

C++ Composer

Group: Members
Posts: 475
Member No.: 49
Joined: 17-January 06

Hello there reader,

After reading some books (C++ for dummies, which is quite a good book!

) I now know about classes, pointer, and functions. After I read about those I thought it was a good idea to first create a program with them and become familiar with them.
So I came up with a banksaving simulator. You could deposit, withdraw money and check you're balance. After all, there are a lot here who posted a program...now it's my turn

There might be easier way to do these things, but remember I had to use pointers, classes and functions.

Please give critics, here it is:

CODE

#include <cstdio>
#include <cstdlib>
#include <iostream>
using namespace std;

class saving
{
public:
int accountNumber;
float balance;
};

void deposit(int amount, saving* pAccount)
{
pAccount->balance += amount;
}

void withdraw(int amount, saving* pAccount)
{
pAccount->balance -= amount;
}

float getBalance(saving* pAccount)
{
return pAccount->balance;
}

int main(int nNumberofArgs, char* pszArgs[])
{
saving account;
bool correct = false;
int option;
float amount;

while (correct == false)
{
system("CLS");
cout << "Welcome to you're very own banksaving program.\n"
<< "Here you can simulate you're own bank account\n"
<< "and in that check up you're balance. (yes I know,\n"
<< "you can also use a calculator)"
<< endl
<< "What is you're bankaccountnumber: ";

cin >> account.accountNumber;

cout << "What is you're current balance: ";

cin >> account.balance;

cout << "\nGood, is this information correct?\naccountnumber: " << account.accountNumber
<< "\ncurrent balance: " << account.balance << "\n0 - no\n1 - yes" << endl;

cin >> correct;
}

while (true)
{
system("CLS");
cout << "Now, what do you want to do?\n"
<< "1 - Deposit money\n"
<< "2 - Withdraw money\n"
<< "3 - Check my balance\n"
<< "4 - Quit\n";

cin >> option;

if (option == 1)
{
cout << "\nHow much money do you want to deposit?\n";
cin >> amount;
deposit(amount, &account);
cout << amount << " is deposited." << endl;
system("PAUSE");
}
if (option == 2)
{
cout << "\nHow much money do you want to withdraw?\n";
cin >> amount;
withdraw(amount, &account);
cout << amount << " is withdrawn." << endl;
system("PAUSE");
}
if (option == 3)
{
amount = getBalance(&account);
cout << "You're balance is: " << amount << "." << endl;
system("PAUSE");
}
if (option == 4)
{
break;
}
}

system("CLS");
cout << "Thank you for using this program." << endl;

system("PAUSE");
return 0;
}

--------------------

BLOOP!

Neken

Posted: May 27 2006, 02:35 PM

DirectX Guru

Group: Global Moderators
Posts: 515
Member No.: 11
Joined: 24-September 05

2 things here :

#1 :

CODE

class saving
{
public:
int accountNumber;
float balance;
};

a struct is like a class except that by default, it is public: .
while there is no other differences, c++ programmers prefer to use structs when they only contain public variables and methods. but what you did is NOT an error.

#2 :

CODE

class saving
{
public:
int accountNumber;
float balance;
};

void deposit(int amount, saving* pAccount)
{
pAccount->balance += amount;
}

void withdraw(int amount, saving* pAccount)
{
pAccount->balance -= amount;
}

float getBalance(saving* pAccount)
{
return pAccount->balance;
}

since these functions are touching the class, why are you not putting them inside of the class ? like this :

CODE

class saving
{
public:
int accountNumber;
float balance;
void deposit(int amount);
void withdraw(int amount);
float getBalance();
};

void saving::deposit(int amount)
{
balance += amount;
}

void saving::withdraw(int amount)
{
balance -= amount;
}

float saving::getBalance()
{
return balance;
}

this way, it'll be easier to do the things with the class :

CODE

saving account;
account.deposit(10);
cout << account.getBalance();

#3 :

variables members of a class or struct should take a "m_" in front of their names, to differienciate the "member of"->(the meaning of m_ is this) the function :

CODE

class saving
{
public:
int m_accountNumber;
float m_balance;

void deposit(int amount);
void withdraw(int amount);
float getBalance();
};

void saving::deposit(int amount)
{
m_balance += amount;
}

void saving::withdraw(int amount)
{
m_balance -= amount;
}

float saving::getBalance()
{
m_return balance;
}

--------------------

nIrium Project user posted image

Stenny

Posted: May 27 2006, 02:44 PM

C++ Composer

Group: Members
Posts: 475
Member No.: 49
Joined: 17-January 06

first of all, thnx for the reply

#1. Thanks for the comment. I have never heard of a struct though, so that's not really a prob (I think the book'll cover that later on)

#2. I did that only because I had to use pointers and that was the first I thought of

CODE

void deposit(int amount, saving* pAccount)
{
pAccount->balance += amount;
}

void withdraw(int amount, saving* pAccount)
{
pAccount->balance -= amount;
}

float getBalance(saving* pAccount)
{
return pAccount->balance;
}

in those functions each time there is one argument which points towards saving account. I also know you can place functions in classes. New Q:
What's more commonly used:
declaring the prototype in the class and defining the function outside the class (to save memory) or defining it in the class to. If the answer is the first, then where do you define it. in the main *.cpp or in some header?

#3. Ok, thanks

~ Stenny

--------------------

BLOOP!

Neken

Posted: May 27 2006, 02:51 PM

DirectX Guru

Group: Global Moderators
Posts: 515
Member No.: 11
Joined: 24-September 05

defining a class method in the class definition is touchy. it all depends of where you declare it.

if you define the class in a source file (.cpp), it won't change anything ... like this :

CODE

class saving
{
public:
int m_accountNumber;
float m_balance;

void deposit(int amount)
{
m_balance += amount;
}

void withdraw(int amount)
{
m_balance -= amount;
}

float getBalance()
{
m_return balance;
}
};

HOWEVER, if you declare your class in a header (.h) and define some methods there too, they will be inline and you will show their content :

inline : the code in inline functions is not compiled there. except, it is copied where it is needed then compiled there. if you use it really often, and it is kinda big, it can really make you .exe bigger. since (.h) are never compiled, it's kinda logic the defined function there will be inline.

show their content : most of the time, in a header, you don't want users of the class to see all the implementation of it. they want to see a brief view of the class possibilities, their methods.

--------------------

nIrium Project user posted image

Stenny	Posted: May 27 2006, 02:55 PM
C++ Composer Group: Members Posts: 475 Member No.: 49 Joined: 17-January 06	yes, that's what I mean. Cuz if you do it inline ánd in the class, then each time the class will be needed the methods will be compiled too. So you'd say to compile them inside the header but outside the class... -------------------- BLOOP!

Maxine	Posted: May 27 2006, 03:46 PM
Mega Member Group: Members Posts: 71 Member No.: 97 Joined: 23-May 06	allthough a bankprogram where you can deposit and withdraw etc.. could be made without pointers and classes for the less experienced guys i'll post it soon -------------------- My social life... Playing with my band Partying with friends Being with my girlie Learning computer programming ------------------------------------------------>

Stenny	Posted: May 27 2006, 03:52 PM
C++ Composer Group: Members Posts: 475 Member No.: 49 Joined: 17-January 06	yes, but here's the pointers and classes version -------------------- BLOOP!

Cardinal	Posted: May 31 2006, 07:35 PM
The Lizard King Group: Members Posts: 244 Member No.: 34 Joined: 6-January 06	Damn you people just know far to much, I'm lazy I did GH lessons then thats about it, I just mess about with stuff. I'm impressed at the skill level on here !!! Any of you ever find that you can just read stuff though and know what it means etc ? I have not learnt it but once you have a basic knowledge about some things the rest just follows suit. -------------------- Aiming for heaven in 2007......

Stenny	Posted: Jun 1 2006, 04:44 PM
C++ Composer Group: Members Posts: 475 Member No.: 49 Joined: 17-January 06	Whaha thnx, but this is nothing compared to all the things in C++. And if you want to know, I just read (not finished) C++ for dummies, that's all. -------------------- BLOOP!

polar productions	Posted: Jun 11 2006, 05:34 AM
Advanced Member Group: Members Posts: 32 Member No.: 62 Joined: 26-January 06	Where you are checking which option is checked, would it not have been better to use a switch case structure? I believe that is what I would have done, however, I am not to experienced in c++, so this is really more for me to learn from!

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