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Invoice
- 建立类Invoicek,创建一个名为发票Invoicek的类,商店可以使用它表示店中售出一款商品的一张发票。有四个信息:零件号,零件描述,售出量,单价。-Establish class Invoicek, create a class called Invoice Invoicek and shops can use it, said the store sold a commodity invoice. There are four pieces of information: part nu