蛇

#include <stdio.h>
#include <stdlib.h>
#define N 4

void main()
{
int a

= { 0 };
int data = 1;

for (int i = 0; i < N; i++)
{
for (int j = 0; j < N; j++)
{
a[i][j] = 0;
}
}

for (int i = 0, j = 0, k = 0; k < (N + 1) / 2; k++)
{
while (j < N - k)//控制层数
{
a[i][j] = data;//赋值
j++;//往右边移动
data++;
}
j--;//退回
i++;//转向

while (i < N - k)
{
a[i][j] = data;
i++;
data++;
}

i--;
j--;//退回转向
while (j > k - 1)//减去一层
{
a[i][j] = data;
j--;
data++;
}

j++;
i--;
while (i > k)
{
a[i][j] = data;
i--;
data++;
}
i++;
j++;
}

for (int i = 0; i < N; i++)
{
for (int j = 0; j < N; j++)
{
printf("%4d", a[i][j]);
}
printf("\n");
}

system("pause");
}