Question

i’m doing this project Banking System
This system tracks customers’ accounts in a bank. Each account has a number, name, and balance. The system provides the following functionalities: create new account, withdraw, deposit, and close account.
The system has the following interface:
Choose:
1- Add new account
2- Withdraw
3- Deposit
4- Get Balance
5- Exit
 When the user chooses 1, the system generates a new ID, and then asks the user to enter a name for that account. The initial balance is set to zero.

 When the user chooses 2, the system asks the user to enter account ID and amount to be withdrawn. If this amount is greater than the balance, a message is displayed that this transaction failed because insufficient balance. If balance is enough, it decreases by amount to be withdrawn.

 When the user chooses 3. The system asks the user to enter account ID and amount to be deposited. System increases balance by this amount.

 When the user chooses 4, the system asks the user to enter account ID then prints account’s name and balance.

 Each time a task is completed the system gets back to the main menu above until the user chooses 5.

# include <iostream>
#include <string>
using namespace std;
# include<iomanip>

class Bank
{
private:
    char name;
    int acno;
    float balance;
public:
    void newAccount();
    void withdraw();
    void deposit();
    void getbalance();
    void disp_det();
    };
//member functions of bank class
void Bank::newAccount()
{
cout<<"New Account";
cout<<"Enter the Name of the depositor : ";
cin>>name;
cout<<"Enter the Account Number : ";
cin>>acno;
cout<<"Enter the Amount to Deposit : ";
cin >>balance;
}
void Bank::deposit()
{
float more;
cout <<"Depositing";
cout<<"Enter the amount to deposit : ";
cin>>more;
balance+=more;
}
void Bank::withdraw()
{
float amt;
cout<<"Withdrwal";
cout<<"Enter the amount to withdraw : ";
cin>>amt;
balance-=amt;
}
void Bank::disp_det()
{
cout<<"Account Details";
cout<<"Name of the depositor : "<<name<<endl;
cout<<"Account Number        : "<<acno<<endl;
cout<<"Balance               : $"<<balance<<endl;
}
// main function , exectution starts here
void main(void)
{
Bank obj;
int choice  =1;
while (choice != 5 )
{
cout<<"Enter \n 1- to create new account \n 2- Withdraw\n 3- Deposit \n 4- get balance\n 5 Exit"<<endl;
cin>>choice;
switch(choice)
{
    case '1' :obj.newAccount();
        break;
    case '2' :obj.withdraw();
        break;
    case 3: obj.deposit();
        break;
    case 4: getbalance();
        break;
    case 5: 
        break;
    default: cout<<"Illegal Option"<<endl;
}
}

}

Answer 1

Problem 1:
You have made a typo in method which gets you the balance & the one which you are calling, rename Bank::disp_det() to Bank::getbalance()

void Bank::getbalance()
{
    cout<<"Account Details";
    cout<<"Name of the depositor : "<<name<<endl;
    cout<<"Account Number        : "<<acno<<endl;
    cout<<"Balance               : $"<<balance<<endl;
}

Problem 2:
You are not calling Bank::getbalance through an object of Bank, Since it is a member function you should call it as follows:

case 4: 
     obj.getbalance();
     break;