#include <stdio.h>

#include <stdlib.h>

#include <string.h>

/*打印螺旋方阵

请输入数组长度:5

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

*/

int main()

{

int num = 1;

int n = 0;

int i, j;int nextI, nextJ = 0;

//Right,Down,Left,Up

int direction[4][2] = {{0, 1}, {1, 0}, {0, -1}, {-1, 0}};

//当前的方向

int d = 0;

printf("请输入数组长度:");

scanf("%d", &n);

int **matrix = (int **)malloc(sizeof(int) * n);

for (i = 0; i < n; i++)

{

matrix[i] = (int *)malloc(sizeof(int) * n);

}

//memset(matrix, 0, sizeof(int) * n * n); not work

//清0

for (i = 0; i < n; i++)

{

memset(matrix[i], 0, sizeof(int) * n);

}

i = j = 0;

while (num <= n * n)

{

matrix[i][j] = num;

nextI = i + direction[d][0];

nextJ = j + direction[d][1];

//若出界，或者下一步已经走过，则转方向

if (nextI < 0 || nextI >= n || nextJ < 0 || nextJ >= n || matrix[nextI][nextJ] !=0)

{

//转方向

d = (d + 1) %4;

}

//准备下一步

i = i + direction[d][0];

j = j + direction[d][1];

num++;

}

for (i = 0; i < n; i++)

{

for (j = 0; j < n; j++)

{

printf("%3d", matrix[i][j]);

}

printf("\n");

}

return 0;

}