level 1
#include
using namespace std;const double PI=3.14;class com{protected:double x,y;public:void set_value(double a,double b=0){x=a;y=b;}virtual void Arae(){cout<<"I just try!"<
set_value(10); ps->Arae();ps=&rec; ps->set_value(20.0,30.0); ps->Arae();}为什么输出的是I just try!I just try!而没有调用void Area(void){cout<<"The area of circle is "<
2005年09月04日 03点09分
1
using namespace std;const double PI=3.14;class com{protected:double x,y;public:void set_value(double a,double b=0){x=a;y=b;}virtual void Arae(){cout<<"I just try!"<
set_value(10); ps->Arae();ps=&rec; ps->set_value(20.0,30.0); ps->Arae();}为什么输出的是I just try!I just try!而没有调用void Area(void){cout<<"The area of circle is "<