Thread: ATM C++ Using functions and cases

This is an assignment of mine, its not perfect but im just posting it..maybe it'll help someone else out...

Code:

#include <iostream>
#include <cmath>
#include <cstdlib>
#include <iomanip> 


using namespace std;


/*function prototypes*/
int mainMenu();
int menu();
void displayBalance();
void withdrawFunds();
void depositFunds();


/*global variables*/
  double balance= 250000.00;


int main(){

 cout << fixed << showpoint << setprecision(2); //Set the numeric output formatting
     
    // Declaring variables 


    int ac_number= 258647;
    int pin= 33284;


             //Prompts user to enter Account number and PIN
        cout <<"\t**********************************************************\n" << endl
            <<" \t\t    THE 1st CHOICE INTERNATIONAL BANK\n\n\t\t\t ------* WELCOME *------\n" << endl 
             <<"\t**********************************************************\n\n"
             <<"\t\t\t\tUSER LOGIN" << endl
             << "\n\t\t\t------ Enter Account Number: ";
           cin  >> ac_number;
        cout << "\n\t\t\t------ Enter PIN: ";
           cin  >> pin;
        cout << "\n";


        while (ac_number != 258647 || pin != 33284) 
  {     
                    system ("CLS"); // Clears screen
             
          cout <<"\t**********************************************************\n" << endl
     <<" \t\t    THE 1st CHOICE INTERNATIONAL BANK\n\n\t\t\t ------* WELCOME *------\n" << endl 
             <<"\t**********************************************************\n\n"
             <<"\t\t\t\tUSER LOGIN\n" << endl
             <<"\t\tINVALID ACCOUNT NUMBER OR PIN WAS ENTERED\n" << endl
             << "\n\t\t\t------ Enter Account Number: ";
           cin  >> ac_number;
        cout << "\n\t\t\t------ Enter PIN: ";
           cin  >> pin;
        cout << "\n";
  }//end while


            system ("CLS");
            menu(); //function call
 }//end main()


 /*------------------------------------------------------------------------------------------------*/
  int menu(){


        switch(mainMenu()){
         
  case 1:
 system("cls");
     displayBalance();
     menu(); //function call
  break;
         
  case 2:
 system("cls");
     withdrawFunds();
     menu(); //function call
  break;


  case 3:
 system("cls");
     depositFunds();
     menu(); //function call
  break;


  case 4:
     exit(0);
  break; 


   default:    
     cout <<"\nINVALID ENTRY.... Please Select numbers 1 - 4\n" <<endl <<endl;
     system("pause");
     menu(); //function call
  break;      
         
}//end switch


system("pause");   
return 0;    


}//end menu()


/*---------------------------------*****function definition*****---------------------------------------*/
int mainMenu(){
  
        system("cls");


    int input;
    
  cout <<"\t____________________________________________\n" << endl         /* Main menu begins here*/
             <<"\t"<<"     *************  MENU  *************" << endl           /*prompts user to make choice*/
             <<"\t____________________________________________\n\n" << endl;


  cout <<"\tPlease Enter the number for the Transaction\n" << endl
             << "\t\tPress 1. ----->> Balance Inquiry\n" << endl
             << "\t\tPress 2. ----->> Withdrawal\n" << endl
             << "\t\tPress 3. ----->> Deposit\n" << endl
             << "\t\tPress 4. ----->> Exit\n" << endl;

  cout <<"\t_________________________________________\n" << endl
             << "\t ENTER TRANSACTION NUMBER:- ";            
  cin >> input;


  return input;
}//end mainMenu()


/* --------------------------------*****function definition*****--------------------------------------*/
  void displayBalance(){
            
                cout << "\nAccount Balance is: $" << balance <<"\n" << endl;


                system ("PAUSE");
                system ("CLS"); 
  }//end displayBalance()


/*------------------------------------*****function definition*****------------------------------------*/
  void withdrawFunds(){


       double withdraw = 0.0;


                /* Withdraw Menu beings here & prompts user to make chice*/
        cout << "\tYou have opted to withdraw money\n" << endl            
             << " Please Enter amount you with to withdraw --Type 0 to return to menu: $";
        cin  >> withdraw;
        cout <<"\n";


        system ("cls");                 
                    
             if (withdraw == 0){
        
                    system("cls");
                 
                    menu(); //function call
             }  //end if


             else if (withdraw != 0){
       
             if ( withdraw > balance){          
        
                        system ("CLS");  


        cout << "Value Exceeds Current balance Please enter smaller amount\n" << endl
             << "Please Enter Amount you Wish to Withdraw: $";
        cin >> withdraw;
                         system ("CLS");  


            if (withdraw == 0){
        
                    system("cls");
                 
                    menu(); //function call
             } //end if


        cout << "\nYou Have Withdrawn: $" << withdraw << " From your Accout" <<"\n"<< endl;
              balance = balance - withdraw;
        cout << "Balance is now: $" << balance <<"\n" << endl;
        
                        system ("PAUSE");
                        system ("CLS");  
             } //end if


              else {
        
        cout << "\nYou Have Withdrawn: $" << withdraw << " From your Accout" << endl;
            balance = balance - withdraw;
        cout << "\nBalance is now: $" << balance <<"\n" << endl;
        
                        system ("PAUSE");
                        system ("CLS"); 
      } //end else
    }//end else if
  }//end withdrawFunds()


/*-----------------------------------*****function definition*****--------------------------------------*/
    void depositFunds(){


        double deposit = 0.0; 


/* Deposit Menu beings here & prompts user to make chice*/
        cout << "\tYou Have Opted to Deposit Money\n" << endl
             << " Please Enter Amount You Wish to Deposit --Type 0 to return to Menu: $";
        cin  >> deposit;
        cout <<"\n";


                    system ("cls");            
                    
             if (deposit == 0){
        
                    system("cls");
                 
                    menu(); //function call
             }
        
             else if (deposit != 0){


                    balance= balance + deposit;
                   
        cout << "You Have Successfully added $" << deposit << " to your Account\n" << endl;
        cout << "Balance is Now $" << balance << "\n" <<endl;    


                    system("pause");
                    system ("cls");
    }
  }//end depositFunds()
/*----------------------------------------------------------------------------------------------------*/

ERROR NOTICE : There is an error in withdrawFunds(), if you enter a value exceeding the balance more than once it will give you a negative number the second time around.
You can fix this with a [while] for the error msg.

I cannot locate the file with the correction.

Originally Posted by laserlight

Have you learned about C++ reference parameters?

I haven't yet, im am still at the introductory stage. I guess i will when i begin programming 1 next semester.