Question

warning C4700: local variable 'pp' used without having been initialized

#include<iostream.h>
class point
{
private:
float xcoord,ycoord;
public:
void setx(float x){xcoord =x;}
void sety(float y){ycoord =y;}
float getx();
float gety();
};
float point::getx(){return xcoord;}
float point::gety(){return ycoord;}

void main()
{
point p1,*pp;
p1.setx(3);
p1.sety(8);
pp->setx(5);
pp->sety(7);
cout<<"x1="<<p1.getx()<<",y1";
cout<<p1.gety()<<endl;
cout<<"x2="<<(*pp).getx()<<",y2=";
cout<<(*pp).gety()<<endl;
}
运行不了 停止工作了

Answer 1

point p1,*pp;
pp->setx(5);
pp->sety(7);

pp指针没有指向的空间，给他申请个就行了。

point * pp = new point;