基本语法：new、
new关键字
new创建基本类型变量
void ptr = new char; new short; new int; new float; //delete ptr
void ptr = new int(5); //初始值5
void *ptr = new int[100]; //100个元素的int数组; delete []ptr
void **ptr = new int[5][6]; //delete [][]ptr
new创建类
Test test; Test test = Test(); Test pTest = new Test(1)
Test test(1); Test test = Test(1); Test pTest = new Test();