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写出程序运行结果:_________#include#includeusing namespace std;class Fun{//被积函数,抽象类public: virtual double fun(double x)=0;//被积函数声明为纯虚函数};class Integer{//积分函数，抽象类protected: double result,a,b,step;//Intevalue积分值，a积分下限，b积分上限 int n;public: virtual void Integrate()=0; Integer(double ra=0,double rb=0,int nn=2000){a=ra;b=rb;n=nn;step=(b-a)/n;result=0; } void Print(){cout.precision(3);cout<<"积分值="<Integrate(); Inp->Print(); Inp=&e_s; Inp->Integrate(); Inp->Print(); return 0;}

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