A.floatf_sum(intx,inty)D．cout<<put('A');的次數(shù)為(C)。classDerived:(1)publicBase1，(2)publicBase2(3)Base1::x=x1;_(4)__Base2::x=x2_;(5)voidoutput(){cout<<Base1::x<<''<<Base2::x<<endl;}if(a[i]>x)(2)a[j+i=j];(3)break;Point(intx0,inty0){x=x0;y=y0;}{small_catw1(0.5),w2(0.6),w3(0.4);#include<iostream.h>constdoublePI=3.1415;{public:Shape(doublei){r=i;}virtualvoidArea()=0;virtualvoidPerimeter()=0;protected:doubler;};classCircle:publicShape{public:Circle(doublei):Shape(i){}voidArea(){cout<<"圓的面積是"<<PI*r*r<<endl;}voidPerimeter(){cout<<"圓的周長是"<<2*PI*r<<endl;}};classIn_Square:publicShape{public:In_Square(doublei):Shape(i){}voidArea(){cout<<"圓內接正方形的面積是"<<2*r*r<<endl;}voidPerimeter(){cout<<"圓內接正方形的周長是"<<4*1.414*r<<endl;}};{public:Ex_Square(doublei):Shape(i){}voidArea(){cout<<"圓外切正方形的面積是"<<4*r*r<<endl;}voidPerimeter(){cout<<"圓外切正方形的周長是"<<8*r<<endl;}};voidmain(){ps=newCircle(8);ps->Area();ps->Perimeter();ps->Area();ps->Perimeter();ps->Area();ps->Perimeter();deleteps;}{public:Complex(double,double);friendostream&operator<<(ostream&,Complex&);//對"<<"運算符進行重載friendistream&operator>>(istream&,Complex&);//對">>"運算符進行重載private:doublereal,imag;};#include<fstream>intmain(){inta[10],max,i,order;fstreaminfile("f1.dat",ios::in);if(!infile){cerr<<"openerror!"<<endl;exit(1);}for(i=0;i<10;i++){infile>>a[i];cout<<a[i]<<"";}for(i=1;i<10;i++)if(a[i]>max){max=a[i];order=i;}cout<<"max="<<max<<endl<<"order="<<order<<endl;in();return0;}intAA::MaxMin(int&x,int&y){intmx,my;for(inti=1;i<n;i++){if(a[i]>mx)mx=a[i];if(a[i]<my)my=a[i];}if(n>0)return1;