求两个向量的内积？
#include
using namespace std;
class V
{
double x,y;
public:
V(){}
V(double a,double b)
{
x=a;
y=b;
}
friend V operator*(V a,V b)
{
V c;
c.x=a.x*b.x;
c.y=a.y*b.y;
return c;
}
void show()
{cout< }; int main() { V v1(1,3),v2(2,5),c3; V *p1,*p2; p1=&v1; p2=&v2; c3=(*p1)*(*p2); c3.show(); return 0; }
