I have this coding down below (just posting the Customers Management only).
This a database in which I am adding a customer each time it passes. Now I need to check whether the c.ID which is the client ID exists or not.
I tried doing a method called searchID which returns 1 if it’s found or -1 if it’s not found.
Problem is when I try to run the program, the program literally hangs there. Whether I press 23 or “ENTER” nothing happens and I would need to exit it using the CTRL + C;
so this is how it works:
When I add a customer (Which is a struct) it saves into the file but I first need to check
whether the ID exists in the database or not otherwise I need to ask the user to either input another ID or go back to the Main Menu
Any suggestions please?? thank you
#include<io.h>
#include<fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "..\Headers\common.h"
#include "..\Headers\customerManagement.h"
static FILE *cfp;
static customer c;
#define STRUCTSIZE sizeof (customer)
/** This is the Customers's Main Menu in which the various sections can be
* accessed from here
*/
boolean customerMainMenu()
{
int optionC;
clrscr();
copyright();
printf ("\n\n\n\n\t\t ************* Customer's Main Menu *************\n \n \n");
printf ("Press [1] to add a new Customer\n");
printf ("Press [2] to edit a Customer\n");
printf ("Press [3] to list all Customers\n");
printf ("Press [4] to Show a Customer's last Order\n");
printf ("Press [5] to go back to Main Menu\n\n\n");
if (scanf ("%d",&optionC) == 1)
{
switch (optionC)
{
case 1:
{
clrscr();
getchar();
addCustomer();
break;
}
case 2:
{
printf ("Edit a Customer\n");
break;
}
case 3:
{
clrscr();
listCustomers();
getchar();
while (getchar()!='\n')
{
}
break;
}
case 4:
{
printf ("Customer's Last Order\n");
break;
}
case 5:
{
system ("PAUSE");
break;
}
default:
{
if (optionC != 1 || optionC != 2 || optionC != 3 || optionC != 4 || optionC !=5)
{
clrscr();
printf ("Invalid option!\n");
system ("PAUSE");
customerMainMenu();
}
break;
}
}
}
return TRUE;
}
/**
* This following method will append a customer to the
* database at the end of the file
*
* */
void addCustomer ()
{
char ch;
copyright();
printf ("\n\n\n\n\t\t ************* Add Client **********\n \n \n");
if ((cfp = fopen ("customers.dat","a+b")) == NULL)
{
fputs("Can't open customers.dat file\n",stderr);
}
printf ("\tThis will add another customer to the the database\n");
printf ("\tPress 'Y' to confirm or 'N' to return to the Client Main Menu\n\tWITHOUT adding a customer\n");
ch = getchar();
if (ch == 'n' || ch == 'N')
{
customerMainMenu();
}
else if (ch == 'y' || ch == 'Y')
{
clrscr();
printf ("\n\n\n\n\t\t ************* Add Client **********\n \n \n");
printf ("Please enter Name:\n");
while (scanf ("%s", c.name) == 0 || cCheck(c.name,100) == FALSE);
{
}
printf ("Please Enter Surname: \n");
while (scanf ("%s",c.surname) == 0 && cCheck (c.surname,100) == FALSE);
{
}
printf ("Please Enter ID Card, [NOTE! Only numbers are allowed!]\n");
int cID;
cID = 0;
while (scanf ("%d",&cID)==0)
{
printf ("Only Numbers are allowed!\n");
while (getchar() != '\n')
{
}
}
if (searchID(cID) == 1)
{
printf ("This ID already exists. Client already exists!\n");
printf ("Do you want to input another ID or return to Main Menu?\n");
printf ("Press 'Y' if you enter another ID, press any other key to return to Main Menu\n:");
ch = getchar();
if (ch == 'y' || ch == 'Y')
{
printf ("Enter another ID:\n");
while (scanf ("%d",&cID)==0)
{
printf ("Only Numbers are allowed!\n");
while (getchar() != '\n')
{
}
}
searchID(cID);
}
else if (searchID(cID) == -1)
{
cID = c.ID;
getchar();
}
}
while (getchar()!='\n')
{
}
printf ("Please Enter Address:\n");
gets(c.address);
fwrite (&c,STRUCTSIZE, 1, cfp);
printf ("For Testing purposes:\n");
printf (" %s\n %s\n %s\n %d\n", c.name, c.surname, c.address, c.ID);
askAnother();
}
else
{
printf ("\nInvalid choice! Either Y or N is accepted\n");
system ("PAUSE");
getchar();
addCustomer();
}
}
void listCustomers()
{
if ((cfp = fopen ("customers.dat","rb")) == NULL)
{
fputs("Can't open customers.dat file\n",stderr);
printf ("Returning to Customer Main Menu");
system ("PAUSE");
customerMainMenu();
}
rewind (cfp);
while (fread (&c,STRUCTSIZE,1,cfp)==1)
{
printf ("Customer: %s %s ID: %d\n", c.surname, c.name, c.ID);
}
fclose (cfp);
// system ("PAUSE");
}
void askAnother()
{
printf ("Do you want to add another Customer?\n");
printf ("Enter 'Y' for yes and 'N' to return to the Main Menu\n");
char input;
input = getchar();
if (input == 'Y' || input == 'y')
{
getchar();
addCustomer();
}
else if (input == 'N'|| input == 'n')
{
fclose (cfp);
customerMainMenu();
}
else
{
printf ("Invalid Option! Only Y or N are allowed\n");
system ("PAUSE");
askAnother();
}
}
boolean cCheck(char *test, int max)
{
int x;
for (x =0; x<max; x++)
{
if (isdigit(test[x]))
{
return FALSE;
}
if (x==max)
{
return TRUE;
}
x++;
}
return TRUE;
}
int fileSize()
{
int lengthOfFile;
int file;
file = open("Customers.dat",O_RDONLY,0);
lengthOfFile = lseek (file,0, SEEK_END);
return lengthOfFile;
}
int getNoOfRecords()
{
return (fileSize()/(STRUCTSIZE));
}
/**
* This method will compare the ID passed from the ID of the customer to check
* whether it is exists or not. If it exists it will output 1 otherwise it
* will output -1. This will make sure that the Person's ID is unique
*
*/
int searchID (int cID)
{
// for the while loop
int index;
index = 0;
//gets the number of records currently held in the file.
int records;
records = getNoOfRecords();
//User will input the ID into this variable and it will be checked
//whether it exists or not
int IDstatus;
IDstatus = 0;
while (index != records)
{
fread (&c,STRUCTSIZE,1,cfp);
if (c.ID == cID)
{
IDstatus = 1;
}
else
{
IDstatus = -1;
}
}
return IDstatus;
}
EDIT:
There are either 2 things:
Either the Method is not working the SearchID() method because even though I have 2 IDs which are 0 now, they are still accepting it
or else because of the c.ID which is staying 0.
When I’m inputting the data, it is accepting it BUT when I try to output the whole record, the Client ID stays 0.
Added to that, it IS letting me having Two IDs which are 0 so most probably the method is not working…. Thanks for all the help until now!
You missed to increment index, and of course you should exit the loop when you found the id: