填空题
下列程序中,先声明一个圆类circle和一个桌子类table,另外声明一个圆桌类roundtable,它是由 circle和table两个类派生的,要求声明一个圆桌类对象,并输出圆桌的高度,面积和颜色。请填空完成程序
#include<iostream.h>
#include<string.h>
class circle{
double radius;
public:
circle(double r){radius=r;}
double get_area(){return 3.416*radius*radius;}
};
class table{
double height;
public:
table(double h)<height=h;}
double get_height(){return height;}
};
class roundtable:public table,public circle{
char *color;
public:
roundtable(double h,double r,char c[]): [10] {
color=new char[strlen(c) +1];
[11] ;
};
char*get_color(){return color;}
}:
void main(){
roundtable rt(0.8,1.0,“白色”);
cout<<"圆桌的高:"<<rt. get_height()<<end1;
cout<<"圆桌面积:"<<rt.get_area()<<end1;
cout<<"圆桌颜色:"<<n.get color()<<end1;
}
【参考答案】
[A0] circle(r), table(h) [AA] strcpy(color, c)