螺旋矩阵

原题如下：

打印出参数为N的矩阵，比如输入3，则打印出
1 2 3
8 9 4
7 6 5
输入4
打印出
1 2 3 4
12 13 14 5
11 16 15 6
10 9 8 7

下面是我的答案

#include "stdafx.h"
#include <iostream>
#include <iomanip>
using namespace std;



void PrintArray(int* arr, int len)
{
    int i,j = 0;
    for( i = 0; i < len; i++)
    {
        for( j = 0; j < len; j++ )
        {
            cout << setw(6) << arr[i * len + j];
        }
        cout << "\n";
    }
}

int main()
{
    enum Director
    {
        right,
        bottom,
        left,
        top
    };

    int i = 0;
    cin >> i;
    if (i <= 0)
    {
        return 0;
    }
    Director director = right;
    
    int * martix = new int[i*i];
    int x = 0, y = 0;
    int num = 1;
    int round = 0;
    while(num < i * i)
    {
        cout<< "x=" << x << " y="<< y << "   value = " << num<< endl;
        switch(director)
        {
            case right:
                //如果右边超过边界
                if (x + 2 > i - round)
                {
                    director = bottom;
                }
                else
                {
                    martix[y * i + x] = num++;
                    x++;
                    
                }
                break;
            case bottom:
                if (y + 2 > i - round)
                {
                    director = left;
                }
                else
                {
                    martix[y * i + x] = num++;
                    y++;
                    
                }
                break;
            case left:
                if (x < round + 1)
                {
                    director = top;
                }
                else
                {
                    martix[y * i + x] = num++;
                    x--;
                }
                break;
            case top:
                if (y <= round + 1)
                {
                    //重新开始一轮
                    round ++;
                    director = right;
                }
                else
                {
                    martix[y * i + x] = num++;
                    y--;
                }
                break;
        }
    }
    martix[y * i + x] = num++;
    PrintArray(martix, i);
    system("pause");
    delete[] martix;
    return 1;
}