1. // structure for guests -------------//

struct {
char email: // e-mail address to send invite to
char guests: // guests name
int number: // guests number, so can just reference to this to find the guest
}

2. // invitation---------------------------------//

/*Input ; name of guests, e-mail address, Reference number;*/
/*Output; The invite to be sent */
/*Comment; make invites using printf and scanf. */

3. // send invites----------------------------------//

/*Inputs: guests detail, guest e-mail address, invitation letter, reference number or tracking.*/
/*Output: send invites to all guests, confirm guests have received there invites*/
/*Comment: using structures and loops send invite to all guests, if a guest has not received the invite or has not replied within certain time, send the invites again.*/

4. // Manage replies----------------------------------//

/*Input: name of guest, reference number, reply. */
/*Output: sorting reply invitation structure. */
/*Comment: sort replies using loops. */

5. // Structure replies----------------------------------//

Struct{
Int reply // reply 1 for going, 0 for not going.
Int people // number of people coming with them.
Int number // pointer to structure (guest).
}

5.1 // If no reply, re-send----------------------------------//

/*Input: name of guest, emails, reference number.*/
/*Output: re-send. */
/*Comment: Send invite if no reply. */

6 // Sort out yes----------------------------------//

/*Input: reference number, reply, name of guest.*/
/*Output: sort out who is going. */
/*Comment: sort out yes with bubblesort, delete no using if else.*/

7// print guest list----------------------------------//

/*Input: name of guest, number of people.*/
/*Output: print out list. */
/*Comment: print out list by creating a document of who is going.*/

8. // send details----------------------------------//

/*Input: reference number, name of guest.*/
/*Output: Send details to who is going. */
/*Comment: send detail using loop to sort out yes. */