输出螺旋矩阵

#include <iostream>
#include <iomanip>
using namespace std;
void main()
{
void f(int i,int j,int n,int value,int **a);
int n,p,q;
cout<<"Please input the value of n:"<<endl;
int **a;
    cin>>n;
    a=new int*[n];
    for(int i=0;i<n;i++)
   a[i]=new int[n];
f(0,0,n,1,a);
for(p=0;p<n;p++)
{
   for(q=0;q<n;q++)
    cout<<setw(4)<<a[p][q];
   cout<<endl;
}
}
void f(int i,int j,int n,int value,int **a)    //递归函数，观察得在外层a[i][j]+a[j][i]是一恒值
{
int v=value,i1=i,j1=j,sum,m=n;
a[i][j]=v;
a[i+1][j]=a[i1][j1]+4*n-5;
sum=a[i1+1][j1]+a[i1][j1]+1;
for(j1=j+1;j1<j+n;j1++)
{
   a[i][j1]=++v;
   a[j1][i]=sum-v;
}
for(i1=i+1;i1<i+n;i1++)
{
   a[i1][j1-1]=++v;
   a[j1-1][i1]=sum-v;
}
n=n-2;
value=a[i+1][j]+1;
i++;
j++;
if(n!=0&&n!=1)
   f(i,j,n,value,a);
else
   if(n==1)
    a[i][j]=value;
}