/* -------------------------------------------------
   The purpose of this program is to simulate a
   basic ATM machine and display four key options:
   deposit, withdraw, check balance, and exit.
   A switch statement must be used.
 ------------------------------------------------ */


#include <stdio.h>
#include <stdlib.h>

int main()
{

    // Assume a balance of $500.00 for all users.
    #define BALANCE 500.00

    // Declare variables.
    int iMenuSelect = 0;
    double dUserDeposit = 0.0, dNewBalance = 0.0;
    double dUserWithdraw = 0.0;

    //Print the menu to the console.
    printf("\t*******************\n");
    printf("\t1 -   Deposit\n");
    printf("\t2 -   Withdraw\n");
    printf("\t3 -   Check Balance\n");
    printf("\t4 -   Exit\n");
    printf("\t*******************\n\n");

    //Prompt the user for their selection and store the value.
    printf("Please type the number of the option you would like to perform   >   ");
    scanf("%d", &iMenuSelect);

    //Begin switch statement of variable iMenuSelect.
    switch(iMenuSelect)
    {
        // Deposit, create new balance.
        case 1:

            // Ask for deposit amount, then add it and print new balance.
            printf("\nHow much would you like to deposit?   >   ");
            scanf("%lf", &dUserDeposit);

            // Create and display new balance after deposit.
            dNewBalance = dUserDeposit + BALANCE;

            printf("\nYour new balance is $%.2f.\n", dNewBalance);
            break;

        // Withdraw, create new balance.
        case 2:

            // Ask for withdraw amount, then subtract it and print new balance.
            printf("\nHow much would you like to withdraw?   >   ");
            scanf("%lf", &dUserWithdraw);

            // Create and display new balance.
            dNewBalance = BALANCE - dUserWithdraw;

            if(dUserWithdraw <= 500)
            {
                printf("\nHere is your money. Your new balance is $%.2f.\n", dNewBalance);
            }

            else
            {
                printf("\nYou have insufficient funds.\n");
            }

            break;

        // Check balance, display BALANCE.
        case 3:

            // Display balance.
            printf("\nYour balance is %.2f\n", BALANCE);

            break;

        // Exit program.
        case 4: exit(EXIT_FAILURE);
            break;

        default: printf("\n\nWARNING: Invalid option selected.\n\n");
    }

   return 0;

}