文件名称:a3
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声明一个商品类，其数据成员包括商品类型、商品产地、生产厂商和单价。实现从键盘输入指定个商品数据，并写入文件，可从文件中读出商品数据，并显示。基本要求：实现内容中全部功能
高级要求：实现从文件中查询商品数据，如按商品类型查询，并显示。
-Statement of a commodity category, and its data members including commodity type, commodity production, producers and unit price. Keyboard input from a specified commodity data, and write documents, can be read from the file of goods data, and displayed. Basic requirements: to achieve full functionality of high-level content requirements: the realization of goods from the document query data, such as query by commodity type, and displayed.
高级要求：实现从文件中查询商品数据，如按商品类型查询，并显示。
-Statement of a commodity category, and its data members including commodity type, commodity production, producers and unit price. Keyboard input from a specified commodity data, and write documents, can be read from the file of goods data, and displayed. Basic requirements: to achieve full functionality of high-level content requirements: the realization of goods from the document query data, such as query by commodity type, and displayed.
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a3.cpp