Goods into and pin. Write a program, used to display goods net information, the definition of knowledge points: (1) class and use; (2) the overloaded constructor (3) the definition and use of a static variable (4) the definition of a virtual function and use function description: (1) systems, show the remaining goods at the time of the initial value of information; (2) according to the system prompt for purchase information, after enter according to replenish onr's stock information; (3) press prompted to enter the sales quantity, show the total value of existing goods after enter information; (4) the goods information stored in the file,
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CraZy_ pig LV. The 92018-06-05