Pointers

[Sharan123]

is this how you dynamically allocate have 10 pointer to a single object of class

*ptr[10]=new class_name;
ptr[0]->call();
delete[0]ptr;

and is this how you pass it to a function of arguments
void function (*a, int i)
now function call

int b=1;
function(*ptr,b);

[Zhuge]

No; nearly all of your syntax is incorrect. I'd suggest re-reading whatever section of material you have on dynamic memory. This might help:
http://www.cplusplus.com/doc/tutorial/dynamic/

[Sharan123]

Base class and derived class with reference
So is this correct

int c=0;
BaseClass *ptr[10];
DerivedClass C;
ptr[c]=&C;
ptr[c]->add();
++c;

[Zhuge]

Don't simply give the answer to the TC; the goal here is to help them learn, not give them the answer. Moreover your answer has its own syntax error on line 2...

[Sharan123]

YEs but its edited now no syntax error if this was dynamically allocated pointer will it be
ptr[c]=new DerivedClass
than why does my project retain previous stored values

#include<iostream>/////////////////////
#include<string>///////////////////
#include <conio.h>
#include<string.h>
#include<Windows.h>
using namespace std;
class Account
{
protected:
	 string acn;
	string act;
	float balance;
public:
	
 bool friend getdata(Account a[],int i);
	Account():acn("none"),act("none"),balance(0){}
	Account(string num, string title ,float bal):acn(num),act(title),balance(bal){}
	
	void deposit(int nm)
	{
		balance =balance+nm;
	}
	string getn()
	{
		return acn;
	}
	
		void withdraw()
	{
		int temp;
		cout<<"Enter amount \n";
		cin>>temp;
		if(temp>balance)
		{
		cout<<"Withdraw can't be greater or equal than balance\n your balance is"<<balance<<endl;
		cin>>temp;
		}
		
		else balance=balance-temp;
	}
	void virtual add()
{
	 cout<<"Account number :";
	cin>>acn;
    cout<<"Account title :";
	cin>>act;
	
}


	void virtual display()
{
	cout<<"Account number :"<<acn<<endl;
	cout<<"Account title :"<<act<<endl;
	
}
};

class SavingAccount:public Account
{
protected:
	float intrest;
	double min_bal;
	int years;
public:
	 
	SavingAccount():Account()
	{
	  intrest=.025;
	  min_bal=1000;
	  years=0;
	}
	
	void display()
	{
		balance=balance-(years*intrest);
		cout<<"Balance : "<<balance<<endl;
		cout<<"Intrest : "<<intrest<<endl;
		cout<<"Minimum balance : "<<min_bal<<endl; 
	}
	void add()
	{
		int temp=0;
     Account::add();
	 cout<<"Enter amount of years\n";
	 cin>>years;
	 cout<<"Balance : ";
	cin>>temp;
	if(temp<1000)
	{
		cout<<"minimum balance required is 1000\n";
	cout<<"Enter Balance : ";
	cin>>temp;
	}
	else 
		balance=temp;
	}


};
class CurrentAccount:public Account
{
protected:
	float fee;
	float bonus;//intrest
public:
	
	CurrentAccount():Account()
	{
		fee=250;
		bonus=7.5;
	}
	void display()
	{
		balance=((balance*(bonus))-fee);
		cout<<"Balance : "<<balance<<endl;
		cout<<"Fee : "<<fee<<endl;
		cout<<"intrest :"<<bonus<<endl;
	}
	void add()
	{
		Account::add();
		cout<<"Enter Balance\n";
		cin>>balance;
	}
	
};
bool getdata(Account a[],int i)
 {
	 cout<<"get data called\n";
	 string account_num;
	 int flag=0;
	 Account temp;
	 cout<<"Enter Account number\n";
	 cin>>account_num;
	 for(int j=0;j<=i;++j)
	 {
		 if(a[j].acn==account_num)
		 {
			 
			 return true;
			 break;
		 }
	 }
	 return false;
 }
void inline call()
{
cout<<"Enter 'C' for current account or 'S' for saving account \n";
}
int main()
{
	cout<<"*****************************************************\n";
	cout<<"***********BANK MANAGEMENT SYSTEM********************\n";
	cout<<"*****************************************************\n";
	int c=0;
	int s=0;
	int option;
	char choice;
	Account *ptrc[10];
	Account *ptrs[10];
	CurrentAccount C;
	//for(int i=0;i<10;++i)
	//{
	//ptrc[i]= new CurrentAccount;
	//}
	//for(int i=0;i<10;++i)
	//{
	//ptrs[i]= new SavingAccount;
	//}
	
	while (1)
	{cout<<"Enter option \n";
	cout<<"1 Create Account \n";
	cout<<"2 Withdraw \n";
	cout<<"3 Deposit \n";
	cout<<"4 Display details\n";
	cout<<"5 Exit\n";
	cin>>option;
	if(option==1)
	{call();
		cin>>choice;
		if(choice=='c'||choice=='C')
		{
			cout<<"select option\n";
			ptrc[c]=&C;
			ptrc[c]->add();
			++c;
		}
		if(choice=='s'||choice=='S')
		{
			cout<<"select option\n";
			/*ptrs[s]=&S;*/
			ptrs[s]->add();
			++s;
		}
	}
	if(option==2)
	{call();
		cin>>choice;
		if(choice=='c'||choice=='C')
		{
			
			if(getdata(*ptrc,c)==true)
			{
			ptrc[c]->withdraw();
			}
			else
			{
				cout<<"Account not found\n";
			}
	
			
		}
		if(choice=='s'||choice=='S')
		{
			
			if(getdata(*ptrs,s)==true)
			{
			ptrs[s]->withdraw();
			}
			else
			{
				cout<<"Account not found\n";
			}
	
			
	}
	}if(option==3)
	{call();
		cin>>choice;
		if(choice=='c'||choice=='C')
		{
			int nm=0;
			
			if(getdata(*ptrc,c)==true)
			{
				cout<<"Enter amount to depist\n";
				cin>>nm;
			ptrc[c]->deposit(nm);
			}
			else
			{
				cout<<"Account not found\n";
			}
	
			
		}
		if(choice=='s'||choice=='S')
		{
			int nm=0;
			
			if(getdata(*ptrs,s)==true)
			{
			ptrs[s]->deposit(nm);
			}
			else
			{
				cout<<"Account not found\n";
			}
	
			
	}
	}if(option==4)
	{call();
		cin>>choice;
		if(choice=='c'||choice=='C')
		{
			
			if(getdata(*ptrc,c)==true)
			{
			ptrc[c]->display();
			}
			else
			{
				cout<<"Account not found\n";
			}
	
			
		}
		if(choice=='s'||choice=='S')
		{
			
			if(getdata(*ptrc,c)==true)
			{
			ptrc[c]->display();
			}
			else
			{
				cout<<"Account not found\n";
			}
	
			
		}

	
	}
	

getch();

}
}