// ROOM ASSIGNMENT FUNCTION
int room_assigner(int type, int status) // type (1- smoking 2- non-smoking); status (9-reserve 10-vacant 12-occupied)
{
   FILE *roomPtr;
	int r_num = 0; // room number
   int seeker = 1;  // use to traverse through each record
 
   if((roomPtr = fopen("rooms.txt", "rb+")) == NULL)
   {
   	printf("\nError in opening file");
   }
   else
   {
   	do
      {  // if seeker = 1 then record 1 field room_status should be checked by the if function
      	fseek( roomPtr, ( seeker - 1) * sizeof( ROOM_DATA ), SEEK_SET);
         // read the info. from the file
         fread( &room, sizeof( ROOM_DATA ), 1, roomPtr );
 
         if( room.room_status == 10 )
         {
         	if( type == 1 )      // smoking
            {
            	room.room_rate = 4000;
            }
            else                         // non-smoking
            {
             	room.room_rate = 3000;
            }
            room.room_num = room.room_num;
            room.room_type = room.room_type;
            room.room_status = status;
            r_num = room.room_num;           // assigns the chosen room
            fwrite( &room, sizeof( ROOM_DATA ), 1, roomPtr );
         }
         else
         {
         	seeker++;
         }
      }while(room.room_status != 10 && !feof(roomPtr)); // loop ends only if a empty room was found or the end of the file is reached
   }
 
	return r_num;  // return the choosen room, if zero then a room was not found
}

bool found = false;
do
{
   <snip>
    found = true;
    // line 30 here
    <snip>
} while( found == false && !feof() );

int found = 0;
do
{
   <snip>
    found = 1;
    // line 30 here
    <snip>
} while( found == 0 && !feof(roomPtr) );

#define TRUE 1
#define FALSE 0
 
int done = FALSE;
do
{
    <snip>
     done = TRUE;
} while( done == FALSE && ...);

#define FALSE 0
#define TRUE (!FALSE)
 
int found = FALSE;
 
and inside the loop
found = TRUE;