[C++知识库]6.用c语言实现蛇形数组

回形遍历方阵

输入一个整数n (n <= 10)，构造一个n*n方阵，方阵数值从1开始递增，按照“右 下 左 上”的方式循环向内填充。?
n = 4
? 1? ? ?2? ?3? ? 4
?12 ?13 ?14 ? 5
?11 ?16 ?15? ?6
?10? ? 9? ?8? ? 7

#include <stdio.h>

// 回形遍历方阵
int main()
{
	int arr[10][10] = { 0 };
	int num = 1;
	int n;
	int i, j;
	scanf("%d", &n);
	for (int m = 0, k = n - 1; m <= k; m++, k--)
	{
		for (i = m, j = m; j <= k; j++)//往右走
		{
			arr[i][j] = num++;
		}
		for (i = m + 1, j = k; i <= k; i++)//往下走
		{
			arr[i][j] = num++;
		}
		for (i = k, j = k - 1; j >= m; j--)//往左走
		{
			arr[i][j] = num++;
		}
		for (i = k - 1, j = m; i >= m + 1; i--)//往上走
		{
			arr[i][j] = num++;
		}
	}
	//遍历输出
	for (i = 0; i < n; i++)
	{
		for (j = 0; j < n; j++)
		{
			printf("%3d", arr[i][j]);
		}
		printf("\n");
	}
}