void printStruct(const struct Sales_text * data, bool withHeader)
{
if (withHeader) {
printf(" OrderID ItemID SaleDate CustomerID PaymentType\n");
}
printf("%10.10s %2.2s %10.10s %4.4s %s\n",
data->Order_id, data->Item_id, data->Sale_date,
data->Customer_id, data->Payment_type);
}
/* cで書いちまったよ。　*/