/* Filename: HW4.c */
/* This program simulates an ATM Machine Menu */


/******************************************************************
 *                                                                *
 * Programmer: Matthew Glynn                                      *
 * Date : 02/15/2007                                              *
 * Section Number: B36                                            * 
 * Filename: HW4.c                                                *
 * Description: This program simulates the menu system of an ATM  *
 *     Machine													  *
 *                                                                *
 ******************************************************************/


#include <stdio.h> /* library to be used */

/* Declare functions */

void printMenu( void );
void deposit( void );
void withdrawal( void );
void inquiry( void );

/* Declare Global variables */
                 
	/* Floating Variables */

float number1; /* global variable used in deposit and withdrawal functions */
float accountvalue = 100;  /*start the account with $100.00 */    

	/* Integer Variable */
int choice;										  

/* Main function */

float main( void )
{

	/* Display this at start of program */
	printf("\n Thank you for opening a bank account with us.\n"); 
	printf(" Currently your balance is $100.00.\n");

	do /* Part of a do while statement (do while choice is not equal to 4)*/

	{/* start do */


			printMenu();  /* CALL FUNCTION PRINTMENU*/


					
					switch ( choice )/* Switch on menu choice entered by user */
					{
						/* Addition */
						case 1:

							deposit();/* CALL FUNCTION DEPOSIT */
							inquiry();/* CALL FUNCTION INQUIRY */

										break;
						
						case 2:
							withdrawal();/* CALL FUNCTION WITHDRAWAL */
							inquiry();/* CALL FUNCTION INQUIRY */

										break;
					
						case 3:

							inquiry();/* CALL FUNCTION INQUIRY */


							break;
		

						case 4:

							break;

							default: /* display default when a choice <0 or >4 has been entered */
								printf("\n**************************************************\n");
								printf("  An invalid entry was made.\n");
								printf("\n**************************************************\n");
						
					}

				} /* end while */

	while (choice !=4); /* when an entry of 4 is made, exit program */

		return 0; /* indicate program ended successfully */

}/* End funcyion main */


/******************************************************************
 *                                                                *
 * Programmer: Matthew Glynn                                      *
 * Name: printMenu                                                *
 * Function: This function prints the main menu of the program.   *
 * Algorithm: This function is a series of printf statements.     *
 * Input: none                                                    *
 * Output: changes the global variable choice, so no real output  *
 *                                                                *
 ******************************************************************/

void printMenu( void )
{
		 
		printf("\n Enter 1 for a Deposit.\n ");
		printf("Enter 2 for a Withdrawal.\n "); 
		printf("Enter 3 for an Inquiry.\n ");
		printf("Enter 4 to Exit.\n ");
						
		scanf("%d", &choice);

		printf("\n");
	
}/* ends function printmenu */


/******************************************************************
 *                                                                *
 * Programmer: Matthew Glynn									  * 
 * Name: deposit                                                  *
 * Function: This function adds money to the account value        *
 * Algorithm: This function returns the sum of account total      *
 * and the deposit                                                *
 * Input: Global Variables                                        *
 *                                                                *
 * Output: changes global variables so no real output             *
 *                                                                *
 ******************************************************************/

void deposit( void )
{
							/* Prompt user for first number */
			    printf("\n**************************************************\n");
				printf("  How much money would you like to deposit?");
				printf("\n**************************************************\n");
				scanf("%f", &number1);
				printf("\n");

								if (number1 < 0)
				{
					printf("\nPlease enter a positive number\n");
				}
				else
				{
				
				accountvalue = accountvalue + number1;/* change account balance */ 

				printf("A deposit of $%.2f has been made to you account.\n", number1);

				}

}/* ends function deposit */

/******************************************************************
 *                                                                *
 * Programmer: Matthew Glynn                                      *
 * Name: withdrawal                                               *
 * Function: This function subtracts two integers.                *
 * Algorithm: This function returns the sum of account total      *
 * and the withdrawal                                             *
 * Input: Global Variables                                        *
 *                                                                *
 * Output: changes global variables so no real output             *
 *                                                                *
 ******************************************************************/

void withdrawal( void )
{
				printf("\n**************************************************\n");
				printf("  How much money would you like to withdraw?");
				printf("\n**************************************************\n");
				scanf("%f", &number1);
				printf("\n");

				if (number1 < 0 || number1 > accountvalue)
				{
				printf("\nPlease enter a positive number that is not greater than your balance\n");
				}
				else
				{

				accountvalue = accountvalue - number1;/* change account balance */ 

				printf("A withdrawal of $%.2f has been made from you account.\n", number1);

				}
}/* ends function withdrawal */

/******************************************************************
 *                                                                *
 * Programmer: Matthew Glynn                                      *
 * Name: inquiry                                                  *
 * Function: Displays the account balance                         *
 * Algorithm: Displays the account balance                        *
 * Input: Global Variables                                        *
 *                                                                *
 * Output: displayes global variable so no real output            *
 ******************************************************************/

void inquiry( void )
{
		/* Display the account balance */ 
			printf("\n Your account balance is $%.2f\n" ,accountvalue);

}/* ends function inquiry */

/*************************************************************************
 * Programmed by: Matt Glynn                                             *
 *************************************************************************/