void process(PriceFile* price_file)
{
	ItemRecord *item_record_ptr;
	ItemRecord new_record;
	char ascii_code_number[100];
	int status;
	char upc[11];
	char description[100];
    double temp_price;
	unsigned price;
	int i;
	int mode;
	int old_mode;
	char temp_string[100];
	char temp2[100];
	int field_length;

	mode = INPUT_MODE;
	old_mode = LOOKUP_MODE;

	for (i = 0; ; i ++)
		{
		if (mode == INPUT_MODE)
			{
			if (old_mode != INPUT_MODE)
				{
				printf("Now in INPUT mode.\n");
				old_mode = INPUT_MODE;
				}
			printf("Please enter code number,\n");
			printf("ENTER to switch to lookup mode,\n");
			printf("or * to terminate the program.\n");
			gets(temp_string);
			if (strcmp(temp_string,"*") == 0)
				break;
			if (strlen(temp_string) == 0)
				{
				mode = LOOKUP_MODE;
				continue;
				}
			field_length = strlen(temp_string);
			if (field_length > ASCII_KEY_SIZE)
				{
				printf("UPC code is a maximum of %d characters\n",
					ASCII_KEY_SIZE);
				continue;
				}
			else if (field_length < ASCII_KEY_SIZE)
				{
				memset(temp2,0,ASCII_KEY_SIZE+1);
				memset(temp2,'0',ASCII_KEY_SIZE-field_length);
				strcat(temp2,temp_string);
				strcpy(temp_string,temp2);
				}
			ascii_to_BCD(new_record.upc,temp_string,ASCII_KEY_SIZE);
			
			printf("Please enter description: ");
			gets(temp_string);
			field_length = strlen(temp_string);
			if (field_length > DESCRIPTION_CHARS)
				{
				printf("Description is a maximum of %d characters\n",
				DESCRIPTION_CHARS);
				continue;
				}
			ascii_to_radix40((unsigned int *)new_record.description,
			(unsigned char *)temp_string, DESCRIPTION_CHARS);

			printf("Please enter price: ");
			gets(temp_string);
			temp_price = atof(temp_string);
			if (temp_price > 655.35)
				{
				printf("Price too large - limit is $655.35\n");
				continue;
				}
			new_record.price = (unsigned)(100*temp_price);

			status = write_record(price_file,new_record);
			if (status == FILE_FULL)
				{
				printf("Cannot add entry for item #%s to file\n",
				new_record.upc);
				break;
				}
			else if (status == FOUND)
				printf("Item #%s already in file\n",new_record.upc);
			}
		else
			{
			if (old_mode != LOOKUP_MODE)
				{
				printf("Now in LOOKUP mode.\n");
				old_mode = LOOKUP_MODE;
				}
			printf("Please enter code number: ");
			gets(temp_string);
			if (strcmp(temp_string,"*") == 0)
				break;
			if (strlen(temp_string) == 0)
				{
				mode = INPUT_MODE;
				continue;
				}
			field_length = strlen(temp_string);
			if (field_length > ASCII_KEY_SIZE)
				{
				printf("UPC code is a maximum of %d characters\n",
					ASCII_KEY_SIZE);
				continue;
				}
			else if (field_length < ASCII_KEY_SIZE)
				{
				memset(temp2,0,ASCII_KEY_SIZE+1);
				memset(temp2,'0',ASCII_KEY_SIZE-field_length);
				strcat(temp2,temp_string);
				strcpy(temp_string,temp2);
				}
			strcpy(ascii_code_number,temp_string);
			status = lookup_record(price_file,ascii_code_number,
				&item_record_ptr);
			if (status == FOUND)
				{
				BCD_to_ascii(upc,&item_record_ptr->upc[0],ASCII_KEY_SIZE);
				radix40_to_ascii((unsigned char *)description,
				&item_record_ptr->description[0], DESCRIPTION_CHARS);
				price = item_record_ptr->price;
				printf("%s:%s:%u\n",upc,description,price);
				}
			else if (status == NOT_IN_FILE)
				printf("Item #%s not found\n",ascii_code_number);
			}
		}
}