HSC: Bank

#include<iostream.h>
#include<conio.h>

class account
{       public:
    int no;
    int bal;
    public:
    account()
    {bal=5000;}
    void deposit(int val);
    int withdraw(int val);
    void checkbal();
    void giveoptions();

};
void account:: deposit(int val)
    {
     bal+=val;
    }

int account::  withdraw(int val)
    {
     bal-=val;
     return val;
    }

void account:: checkbal()
    {
    cout<<"balance is"<<bal<<endl;
    }


void account :: giveoptions()
{
 int ch=0,val;
 while(ch!=4)
 {
 cout<<"MENU \n 1.Deposist 2.Withdraw \n 3.Checkbal\n4.Exit"<<endl;
 cin>>ch;

 switch(ch)
 {
 case 1:cout<<"\nenter value to deposit\n";
    cin>>val;
    deposit(val);
    checkbal();
    break;

 case 2:cout<<"\nEnter value to withdraw\n";
    cin>>val;
    if(bal<=val+5000)
    {
    cout<<"\nCannot withdraw. You're poor\n";
    break;
    }
    cout<<"\nCollect your money"<<withdraw(val);
    checkbal();
    break;

 case 3: checkbal();
    break;
 case 4: break;
 default: break;
 }
 }
}

void main()
{
clrscr();
int n;
account a1,a2,a3;
a1.no=123;
a2.no=456;
a3.no=789;
for(int i=0;i<3;i++)
{
cout<<"Enter account number"<<endl;
cin>>n;
if(n==123)
{a1.giveoptions();}
if(n==456)
{a2.giveoptions();}
if(n==789)
{a3.giveoptions();}

}
getch();
}