关于C++的程序中友元函数的使用

其实男生女生可以设计成一个类，按照本题需求。不过勉为其难为两个类也可以。
#include <iostream>
#include <vector>

using std::cout;
using std::cin;
using std::endl;

class Person
{
private:
char name[10];
double height;
double weight;
public:
Person():height(0.0),weight(0.0)
{
strcpy(name,"null");
}

Person(const char *name,double h, double w):height(h),weight(w)
{
strncpy(this->name,name,sizeof(name));
}

virtual void setInfo()
{
cout << "Please input the name" << endl;
cin >> name;
cout << "Please intput the height" << endl;
cin >> height;
cout << "Please intput the weight" << endl;
cin >> weight;
}

virtual bool getSex()
{
return true;
}

friend void GetInfo(Person &p,double *sumH,