若有以下程序:
#include ＜iostream＞
using namespace std;
#define PI 3.14
class Point
private:
int x,y;
public:
Point(int a,int B)
x=a;
y=b;
int getx()
return x;
int gety()
reurn y;
;
class Circle: public Point
private:
int r;
public:
Circle(int a,int b.int C) :Point(a,B)
r=c;
int getr()
return r;
double area()
return PI*r*r;
;
int main()
Circle cl(5,7,10);
cout＜＜c 1 .area()＜＜end1;
return 0;
程序执行后的输出结果是
A．314
B．157
C．78.5
D．153.86
