Undeclared identifier- C++ - c++

Question

I am doing a project for school and keep running into this reoccurring problem, my code does not seem to run as I have "undeclared identifiers." I have tried renaming them or redefining them but the same errors keep going or more. I am using VS code at the moment and read about maybe it was VScode itself but I get the same errors regardless.
#include <iostream>
#include <stdlib.h>
#include <string>
#include <fstream>
using namespace std;
class bankAccount {
public:
int accountNum;
string accountName;
string accountType;
double accountBalance;
double accountInterest;
double getInterest;
double updateBalance;
bankAccount(){
accountNum = 0;
accountName = "";
accountType = "";
accountBalance = 0.0;
accountInterest = 0.0;
}
void deposit()
{
long amount;
cout << "\n Please enter the amount you would like to deposit: ";
cin >> amount;
accountBalance = accountBalance + amount;
}
void withdraw()
{
long amount;
cout << "Please enter the amount you would like to withdraw: ";
cin >> amount;
if (amount <= accountBalance)
{
accountBalance = accountBalance - amount;
}
else
{
cout << "You do not have sufficient funds" << endl;
}
}
void interest(){
double getInterest;
cout << "Please enter desired interest amount: ";
cin >> getInterest;
}
void update(){
double updateBalance;
updateBalance = accountBalance * getInterest;
accountBalance += updateBalance;
}
void print(){
string print;
cout << "Welcome Back " << accountName << "," << endl;
cout << "\n Account Number: " << accountNum << endl;
cout << "\n Account Type: " << accountType << endl;
cout << "\n Current Balance: " << accountBalance << endl;
cout << "\n Account Interest: " << accountInterest << endl;
}
void openAccount(){
cout << "Enter Account Number: ";
cin >> accountNum;
cout << "Enter Account Holders Name: ";
cin >> accountName;
cout << "Enter Account Type: ";
cin >> accountType;
cout << "Enter Initial Balance: ";
cin >> accountBalance;
cout << "Enter Interest Rate: ";
cin >> accountInterest;
}
};
int main() {
int choice;
do
{
cout << "Please select the following options ";
cout << "\n 1:View Account";
cout << "\n 2: Open Account";
cout << "\n 3: Deposit" ;
cout << "\n 4: Withdraw ";
cout << "\n 5: Update account";
cin >> choice;
switch (choice)
{
case '1':
print ();
break;
case '2':
openAccount();
break;
case '3':
deposit();
break;
case '4':
withdraw();
break;
case '5':
updateBalance();
break;
}
} while (case !=5);
}

Answer 1

suggested creating an instance of class bankAccount somewhere before switch statement and call the functions like, instance_of_bankAccount.functionName();
At end of loop instead of (case !=5) it should be (choice != 5)

Answer 2

The problem with your code is that you do not have any instance of the class bankAccount, which means you try to call the function which actually does not exist. To fix it, you should create an object of the bankAccount type before the loop in which you can select the operation you want to perform:
int main() {
int choice;
bankAccount bankAcc; // this creates the object we need
do ...
And then for every case you wanted to call the function f(), add prefix bankAcc., so it becomes bankAcc.f(). In your code, it would be:
switch (choice) {
case '1':
bankAcc.print();
break;
case '2':
bankAcc.openAccount();
break;
case '3':
bankAcc.deposit();
break;
case '4':
bankAcc.withdraw();
break;
case '5':
bankAcc.updateBalance();
break;
}
Thanks to it, all functions called will know that they belong to bankAcc and they will change properties only of this particular object.
There is also another mistake in your code: did you really mean to use chars in your switch? At the moment cin >> choice reads an int, saves it in choice and then in switch it gets compared with all values corresponding to cases. The problem is that 1 is very different from '1' (which is casted to the value 49), so inputted int will never satisfy conditions from the menu you print.
Also, while (case !=5) should be changed to while (choice != 5).