C++ 代码

#include <iostream>
using namespace std;

int main()
{
    int n,m,i,j,a[110][110],x1,y1,x2,y2;
    do
    {
        cin>>n;
        if(n==0) break;
        x1=0;x2=n-1;y1=0;y2=n-1;m=0;
        do
        {
            m++;
            for(i=x1;i<=x2;i++)
                for(j=y1;j<=y2;j++)
                    a[i][j]=m;
            x1++;y1++;x2--;y2--;
        }while(x1<=x2);
        for(i=0;i<n;i++)
        {
            for(j=0;j<n;j++) cout<<a[i][j]<<' ';
            cout<<endl;
        }
        cout<<endl;
    }while(n!=0);
    return 0;
}