Menu structure: 1. Adding types of products: 2. Display types of products: 3. In...

代码说明：

菜单结构: 1. 添加商品品种: 2. 显示商品品种: 3. 查询品种: (1) 按商品名称查询 (2) 按商品代码查询 4. 删除品种: (1) 按商品名称删除 (2) 按商品代码删除 (3) 退出 5.商品进库: (1) 添加新的品种 (2) 在原品种中添加品牌 a. 添加新品牌 b. 增加某一品牌数量 i. 按品牌名称操作 ii. 按品牌代码操作 (3) 退出 6.商品出库: (1) 按商品名称出库 (2) 按商品代码出库 (3) 退出 7.退出 -Menu structure: 1. Adding types of products: 2. Display types of products: 3. Inquiries varieties: (1) by product name query (2) by commodity codes in query 4. Remove the species: (1) by product name deleted (2) by Delete commodity codes (3), exit 5. goods into the library: (1) add a new variety (2) In the original species to add the brand a. increased b. add a new brand of a brand by brand name i. the number of operations ii. by brand Code operation (3) exit 6. goods out of libraries: (1) by product name out of library (2) by commodity codes in a library (3) Exit 7. Exit