王婆卖瓜，每卖一个瓜记录该瓜的重量，还要记录所卖出的总重量和中个数。同时还允许退瓜。用面向对象方法设计王婆卖瓜的程序，首先要设计类。以西瓜为对象，对西瓜watermelon类定义各种属性和操作。现在用动态内存分配的方案编写该程-Every potter praises his record that each sell a melon melon s weight, but also record the total weight sold and the number. It also all