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答案:
#include#includeusingnamespacestd;classcircle{//圆类public:circle(){r=0.0;}circle(doublec_r){r=c_r;}doublegetArea(){//得到面积returnM_PI*r*r;}private:doubler;//半径};classtable{//桌子类public:table(){height=0.0;color="nocolor";}table(doublet_height,stringt_color){height=t_height;color=t_color;}doublegetHeight(){returnheight;}stringgetColor(){returncolor;}private:doubleheight;//高度stringcolor;//颜色};classroundtable:publiccircle,publictable{public:roundtable(doubler_r,doubler_height,stringr_color):circle(r_r),table(r_height,r_color){}};intmain(){roundtablea=roundtable(0.5,1.2,"red");cout<<"area="<