本程序通过变量数组设置随机雪花的范围和位置，通过循环改变参数，成雪花不停落下的动态效果。-through the procedures set up random variable array of snowflakes and position changes through the cycle parameters, as snowflakes kept falling dynamic effects.

用类实现动态数组的各种操作，获取数组大小，重置数组大小，获取元素，重载[]操作符，追加新元素，删除元素，插入元素，重载=-With class implements a dynamic array of various operations, access to the array size, the size of the array is reset, access to the elements, overloaded [] operator, additional new element

能够实现基于动态数组的定义,从而达到矩阵的变换和乘法运算()