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

void clearInput(void);
void addNewAccount(void);

struct account {
    int number;
    char lastname[15];
    char firstname[15];
    float balance;
    struct account *next;
    };
struct account *firsta,*currenta,*newa;
int anum = 0;

int main()
{
    char ch;
    firsta = NULL;

    do
    {
	clearInput();
        puts("\nA - Add a new account");
        puts("Q - Quit this program\n");
        printf("\tYour choice:");
        ch = getchar();
	ch = toupper(ch);
        switch(ch)
        {
            case 'A':
                puts("Add new account\n");
		clearInput();
                addNewAccount();
                break;
            case 'Q':
                puts("Quit\n");
            default:
                break;
        }
    }
    while(ch != 'Q');

    return(0);
}

/*
 * This function clears any text from the input stream
 */

void clearInput(void)
{
	fflush(stdin);			/* fpurge(stdin) */
}

void addNewAccount(void)
{
    newa = (struct account *)malloc(sizeof(struct account));

/*
 * Check to see if this is the first record
 * If so, then initialize all the pointers to this,
 * first structure in the database
 */

    if(firsta==NULL)
        firsta = currenta = newa;

/* 
 * Otherwise, you must find the end of the structure list
 * (Easily spotted by the NULL pointer) and add on the
 * new structure you just allocated memory for
 */

    else
    {
        currenta = firsta;      /* make the first record the current one */
                                /* and loop through all records: */

        while(currenta->next != NULL)
            currenta = currenta->next;
				/* the last record is found */
        currenta->next = newa;  /* save the address of new */
        currenta = newa;        /* make current record the new one */
    }

/* Now, you just fill in the new structure */

    anum++;
    printf("%27s: %5i\n","Account number",anum);
    currenta->number = anum;

    printf("%27s: ","Enter customer's last name");
    gets(currenta->lastname);

    printf("%27s: ","Enter customer's first name");
    gets(currenta->firstname);

    printf("%27s: $","Enter account balance");
    scanf("%f",&currenta->balance);

/* 
 * Finally, cap the new record with a NULL pointer
 * so that you know it's the last record:
 */

    currenta->next = NULL;
}