Logic Errors in file manipulation c programming

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I have a file called RESERVED.dat and i'm adding room numbers to the file. However if a certain room number has already been entered and i try to enter that same number again i want the program to printf that this room has already been entered. The program works partially, if for e.g. I enter 1 as a room number when the file is empty it first says that the room is currently empty and it is added to the file, so it works properly. If i enter room 2 on a second run of the program it works how it should. And it goes on working properly ONCE i keep entering room #s consecutively in this ascending order.

But here's the problem: Say I enter 3 when RESERVED.dat is empty, it says room 3 is empty and does whatever is in the else {} (which its supposed to do). Then if i go back again and enter 3 it still says room 3 is empty and does the else{} but its not supposed to(it continues saying this until i enter 3 four times in a row, then it finally says room 3 is occupied). But if i enter any number less than 3 e.g(I enter 2) it says room 3 is already occupied thereby, doing the if{} block (when its supposed to be saying room 2 is empty and adding it). Its like it saves all the numbers before the number i actually enter.

main() only contains a switch statement giving options inclusive of this function.

I HAVE TRIED ABSOLUTELY EVERYTHING TO GET THIS WORKING.

struct SuiteRooms {
      int roomNo;
      int occupancy;
};


void addAdult(){
 //struct adltGuests adlt;
 struct SuiteRooms suiterooms = {0,0};
 int room;
 int i;

 ftaken = fopen("RESERVED.dat","rb");
 printf("Enter a room number (1 - 90)");
 scanf("%d",&room);

 fseek(ftaken,(room - 1) * sizeof(struct SuiteRooms),SEEK_SET);
 fread(&suiterooms, sizeof(struct SuiteRooms), 1, ftaken);
 printf("suiterooms.roomNo is %d\n", suiterooms.roomNo);

 if(suiterooms.roomNo!=0){
    printf("Room %d already occupied\n", suiterooms.roomNo);
    system("pause");
    fclose(ftaken);
    menuLoop++;
 }

 else{
    ftaken = fopen("RESERVED.dat","ab");
    printf("Room %d is empty\n", suiterooms.roomNo);
    suiterooms.roomNo = room;
    fseek(ftaken,(suiterooms.roomNo - 1) * sizeof(struct SuiteRooms), SEEK_SET);
    fwrite(&suiterooms, sizeof(struct SuiteRooms), 1, ftaken);
    system("pause");
    menuLoop++;

 }

 fclose(ftaken);

}// End of function addAdult

asked 37 secs ago

CRez

1

Logic Errors in file manipulation c programming