写出程序运行结果:__1__#include #include using 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; }