Program seems to freeze after executing a function? - c

Question

I am doing a program that is a customer order application. Basically it is a database (like e-bay) where a customer must be registered in the system to buy a product. The problem I am currently having is when I come to modify a customer.
Basically when I run the program I have a menu. I choose customer and I have a sub-menu and I choose to modify the customer data. then it asks me for an id and the program checks whether it is valid or not. If the id number is valid it goes on to let you choose which criteria you want to modify. After the modification of that criteria it prints out ~~~ITEM EDITED~~~ and then it just like freeze. Nothing comes afterwards and I have to terminate the program myself.
This happens as well when an invalid id is entered. When this happens it prints out the main menu and when I enter a number to choose from the main menu nothing happens.
I tried solving it myself but cannot find the problem. I tried to use exit(0) instead of break; after the cases but same problem happened. Here under is the code of the modify function. Just to let you know that I have a header file with all the necessary information such as structure declaration.
modify_customer()
{
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);
char another;
int flag = 0;
int choice;
char x[8];
FILE *pCust;
int size;
printf("\nENTER CUSTOMER ID NUMBER: ");
//fflush(stdout);
scanf("%s",x);
flag = checkcustomer(x);
if(flag==0)
{
pCust=fopen("customer.txt","r+b");
rewind(pCust);
while(fread(&cust,sizeof(cust),1,pCust))
{
if(strcmp(cust.id,x)==0)
{
printf("\nid ==> %s",cust.id);
printf("\nname ==> %s",cust.name);
printf("\nsurname ==> %s",cust.surname);
printf("\naddress ==> %s",cust.address);
printf("\nDO YOU WANT TO EDIT THIS REDORD [Y/N]: ");
scanf("%s", &another);
fflush(pCust);
if(another=='Y'|| another=='y')
{
printf("\n(1) EDIT ID NUMBER");
printf("\n(2) EDIT NAME");
printf("\n(3) EDIT SURNAME");
printf("\n(4) EDIT ADDRESS");
printf("\nenter choice (1) - (4) to edit: ");
//fflush(stdout);
scanf("%d",&choice);
switch(choice)
{
case 1 : printf("\nEDIT RECORD [ID]");
printf("\nenter new customerID:");
scanf("%s",cust.id);
size = sizeof(cust);
fseek(pCust,-size,SEEK_CUR);
fwrite(&cust,sizeof(cust),1,pCust);
break;
case 2 : printf("\nEDIT RECORD [NAME]");
printf("\nenter new name: ");
//fflush(stdout);
scanf("%s",cust.name);
size = sizeof(cust);
fseek(pCust,-size,SEEK_CUR);
fwrite(&cust,sizeof(cust),1,pCust);
break;
case 3 : printf("\nEDIT RECORD [SURNAME]");
printf("\nenter new surname: ");
//fflush(stdout);
scanf("%s",cust.surname);
size = sizeof(cust);
fseek(pCust,-size,SEEK_CUR);
fwrite(&cust,sizeof(cust),1,pCust);
break;
case 4 : printf("\nEDIT RECORD [ADDRESS]");
printf("\nenter new address: ");
//fflush(stdout);
scanf("%s",cust.address);
size = sizeof(cust);
fseek(pCust,-size,SEEK_CUR);
fwrite(&cust,sizeof(cust),1,pCust);
break;
}
printf("\n~~~ITEM EDITED~~~");
break;
}
else
{
printf("\nRECORDS ARE NOT MODIFIED");
customer_menu();
}
}
}
}
if(flag==1)
{
printf("\nITEM DOES NOT EXIST. TRY AGAIN");
main_menu();
}
fflush(stdout);
getch();
fclose(pCust);
return 0;
}