#include  using namespace std; double transaction; double currentBalance (5000); char pickTransaction(void); void message (void); void deposit(void); void withdraw(void); // This code only perform one transaction. Modify it to give the user opportunity to perform as many operations as she/he desires. int main() { cout > input; } while ((input != 'B') && (input != 'b') && (input != 'W') && (input != 'w')&& (input != 'D')&& (input != 'd')); return input; } void message (void) { cout > transaction; currentBalance = currentBalance + transaction; message(); } void withdraw(void) { cout > transaction; if (currentBalance   Part A Download the simple banking source file in this module (Module 5 sample codes), and open it in your IDE (Visual Studio, Xcode, GCC, Add three at leas additional functions (services/optionsyou have available or imagine when you use the ATM machine or a bank with a cashier). part R