ATM Machine C language - c

Question

So I have to make an ATM machine program for my Intro to C programming class and I'm getting kinda frustrated. My professor just emailed us saying this: "Under NO circumstances should you declare any pointers. You are provided the pointers you will need to use and those are the function arguments. They should not be re-declared in the functions or in the main function.
You alos need to actually READ the comment I wrote with the assignment. Most (or all ) of you will need to add an argument to the withdrawal function because, to do it correctly, you will need access to the type of account."
I tried not declaring the pointers in the main function but I'd get errors. I also am not sure if I should be using if/else instead of switch, cause every time it asks me if I'd like to do another transaction the program closes no matter which (1, 2, 3) I select.
My last problem is I don't know how to go about updating the amount of money in the selected account when making a transaction. (currball) is confusing...
I really appreciate any help I can get.
// main.c
// Project Assignment 2
//
// Created by Paul Gleichman on 2/22/14.
// Copyright (c) 2014 Paul Gleichman. All rights reserved.
//
#include <stdio.h>
//* Displays the list of user’s options available
//** Displays the user’s selections and sets the value of the choice
void mainMenu(int *choice);
//Prompts the user for the amount of their deposit and updates the selected account
void DepositMoney( double *currBal);
//Asks the user if they want another transaction
void Repeat(char * doAgain);
//Displays the types of account they would like to access and sets the
//value of the chosen account type
void AccountMenu( char *typeAcct);
//Prompts the user for the amount of the withdrawal, determines if there are
//sufficient funds and updates the selected account if funds are dispensed
void WithdrawMoney( double *currBal);
//Displays the user’s current account balance for the selected account
void ShowBalance( double currBal);
int main()
{
double preBal = 4325;
double checking = 575;
double savings = 3750;
double currBal;
int choice;
char doAgain;
char typeAcct;
//Welcome Screen
printf("***** Welcome to Legendary Bank ***** \n");
//Ask user what they'd like to do
printf("** What would you like to do today? ** \n");
//List options
mainMenu(&choice);
switch (choice) {
case 1:
AccountMenu(&typeAcct);
DepositMoney(&currBal);
Repeat(&doAgain);
break;
case 2:
AccountMenu(&typeAcct);
WithdrawMoney(&currBal);
Repeat(&doAgain);
break;
case 3:
AccountMenu(&typeAcct);
ShowBalance(currBal);
Repeat(&doAgain);
}
}
//*Displays the list of user’s options available
//**Displays the user’s selections and sets the value of the choice
void mainMenu(int *choice)
{
printf("1 - DEPOSIT \n");
printf("2 - WITHDRAWAL \n");
printf("3 - CHECK ACCOUNT BALANCE \n");
printf("Important: ");
printf("To transfer money first select \n(2) for WITHDRAWAL, then \n(1) for DEPOSIT\n");
scanf(" %d", choice);
}
//Prompts the user for the amount of their deposit and updates the selected account
void DepositMoney( double *currBal)
{
printf("How much would you like to deposit?: \n");
scanf(" %lf", currBal);
printf("Thank you, please take your receipt.\n");
}
//Asks the user if they want another transaction
void Repeat(char * doAgain)
{
int choice;
printf("Would you like to make another transaction?\n");
printf("(Y)es / (N)o ? \n");
scanf(" %c", doAgain);
do {
mainMenu(&choice);
} while (doAgain == 'Y' || doAgain == 'y');
}
//Displays the types of account they would like to access and sets the
//value of the chosen account type
void AccountMenu( char *typeAcct)
{
printf("Please select account: \n");
printf("Choose C for Checking\n");
printf("Choose S for Savings\n");
scanf(" %c", typeAcct);
}
//Prompts the user for the amount of the withdrawal, determines if there are
//sufficient funds and updates the selected account if funds are dispensed
void WithdrawMoney( double *currBal)
{
printf("How much would you like to withdraw?\n");
scanf(" %lf", currBal);
printf("Thank you, please take your cash and receipt\n");
}
//Displays the user’s current account balance for the selected account
void ShowBalance( double currBal)
{
printf("You have %lf in your account\n", currBal);
}

Answer 1

You need to do something like this. edited your main and repeat function
int main()
{
double preBal = 4325;
double checking = 575;
double savings = 3750;
double currBal;
int choice;
char doAgain =0;
char typeAcct;
//Welcome Screen
while(1){
printf("***** Welcome to Legendary Bank ***** \n");
//Ask user what they'd like to do
printf("** What would you like to do today? ** \n");
//List options
mainMenu(&choice);
do{
switch (choice) {
case 1:
AccountMenu(&typeAcct);
DepositMoney(&currBal);
Repeat(&doAgain);
break;
case 2:
AccountMenu(&typeAcct);
WithdrawMoney(&currBal);
Repeat(&doAgain);
break;
case 3:
AccountMenu(&typeAcct);
ShowBalance(currBal);
Repeat(&doAgain);
default :
printf("invalid Choice");
Repeat(&doAgain);
}
}while(doAgain == 'Y');
printf("//////////////////NEW TRANSACTION//////////////\n")
}
return 0;
}
in your repeat function
void Repeat(char * doAgain)
{
int choice;
printf("Would you like to make another transaction?\n");
printf("(Y)es / (N)o ? \n");
scanf(" %c", doAgain);
}