一个小问题，困扰了我好久，我把代码给出，帮我看看

#include"iostream"
#include"math.h"
using namespace std;
#define pi 3.14
class all
{
    public:
    virtual void print()=0;
    virtual double MianJi()=0;
 } ;

class Triangle:public all
{
public:
    double x;
    double y;
    double z;
    virtual void print();
    virtual double MianJi();
};

void Triangle::print()
{
    cout<<"Triangle:"<<MianJi()<<endl;
}
double Triangle::MianJi()
{
    double p = ( x+ y + z) / 2.0;
    return sqrt(p * ( p - x)*(p- y)*(p - z));
}

class Rectangle:public all
{
public:
    double x;
    double y;
    virtual void print();
    virtual double MianJi();
};
void Rectangle::print()
{
    cout<<"Rectangle:"<<MianJi()<<endl;
}
double Rectangle::MianJi()
{
    return x*y;
}

class circle:public all
{
public:
    double r;
    virtual void print();
    virtual double MianJi();
};
void circle::print()
{
    cout<<"circle:"<<MianJi()<<endl;
}
double circle::MianJi()
{
   return pi*r*r;
}
void qort(all* a[100],int n)
{
    int i=0,k=0;
    for(i=0;i<n-1;i++)
    {
        for(k=i+1;k<n;k++)
        {
            if(a[i]->MianJi()>a[k]->MianJi())
            {
                all* temp;
                temp=a[i];
                a[i]=a[k];
                a[k]=temp;
            }
        }
    }
}
int main()
{
    int n;
    string s;
    all* A[100];
    Triangle* Tr;
    Rectangle* Re;
    circle* Ci;
    cin>>n;
    for(int i=1;i<=n;i++)
    {
                cin>>s;
                if(s=="Triangle")
                {
                    Tr=new Triangle();
                    cin>>Tr->x>>Tr->y>>Tr->z;
                    A[i]=Tr;
                } 
                if(s=="Rectangle")
                {
                     Re=new Rectangle();
                    cin>>Re->x>>Re->y;
                    A[i]=Re;
                }
                if(s=="circle")
                {
                    Ci=new circle();
                    cin>>Ci->r; 
                    A[i]=Ci;
                }
                
        }
    }
    qort(A,n);
    for(int i=0;i<n;i++)
    {
        A[i]->print();
     } 
    return 0;
}

把qort（A,n）前的“}”去掉，多写了一个