編程題-實現蛇形輸出

實現如下的蛇形輸出：

1 2 3 4 5

16 17 18 19 6

15 24 25 20 7

14 23 22 21 8

13 12 11 10 9 

具體代碼實現：

#include <stdio.h>
#include <malloc.h>
int main()
{
int n;
int x,y,round;
//a[x][y]，x是二維數組的第一個下標，y是二維數組的第二個下標，
//round是轉的圈數，從0開始。
int count = 1;//從1開始計數
printf("Please input a number:\n");
scanf("%d",&n);//用戶輸入n的值
int (*a)[n] = calloc(n * n,sizeof(int));//創建n*n的矩陣
for(round = 0; round < n / 2; round++)
{
    x = round;
    for(y = round; y < n - round; y++)
    {
        a[x][y] = count;
        count++;
    }
    //print  1,2,3,4,5
    y = n - round - 1;
    for(x = round + 1; x < n - round - 1; x++)
    {
        a[x][y] = count;
        count++;
    }
    //print 6,7,8
    x = n - round - 1;
    for(y = n - round - 1; y >= round; y--)
    {
        a[x][y] = count;
        count++;
    }
    //print 13,12,11,10,9
    y = round;
    for(x = n - round - 2; x > round; x--)
    {
        a[x][y] = count;
        count++;
    }
    //print 16,15,14
}
  if(n % 2 == 1)
{
    a[n / 2][n / 2] = n * n;
}
for(x = 0 ; x < n; x++)
{
    for(y = 0; y < n; y++)
    {
        printf(" %d ",a[x][y]);
    }
    printf("\n");
}
free(a);
return 0;
}