<>按坐标变换值

#include"stdafx.h"
#include <stdio.h>
#include <math.h>
void main()
{
    int a[16][16], i, j, n, k;
    printf("Please input n(1~15,it must be odd.): ");
    scanf("%d", &n);
    while (!(n >= 1 && n <= 15) || n % 2 == 0)//奇数
    {
        printf("The number is invalid.Please insert again:");
        scanf("%d", &n);
    }
    for (i = 1; i <= n; i++)
        for (j = 1; j <= n; j++)
            a[i][j] = 0;
    j = n / 2 + 1;
    a[1][j] = 1;
    i = 1;
    for (k = 2; k <= n*n; k++)//变换值开始范围
    {
        i = i - 1; j = j + 1;
        if (i == 0 && j == n + 1)
        {
            i = i + 2; j = j - 1;
        }
        else
        {
            if (i == 0)
            {
                i = n;
            }
            if (j == n + 1)
            {
                j = 1;
            }
        }//坐标变换
        if (a[i][j] == 0)
        {
            a[i][j] = k;
        }
        else
        {
            i = i + 2;
            j = j - 1;
            a[i][j] = k;
        }
    }//值变换
    for (i = 1; i <= n; i++)
    {
        for (j = 1; j <= n; j++)
            printf("%3d", a[i][j]);
        printf("\n");
    }
}