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#pragma once class CCircle { public : double area(); double girt...
设计二维空间的点类Dot,并将求两点之间距离的函数声明为点类Dot的友元函数。成员变量:double x,y;成员函数:Dot(double xx=0,d...
class complex { double i,j; public: complex(void); complex(double ,double ); ...