Print_spirally.c

//print a square matrix spirally
#include <stdio.h>
#define MAX 20

int main(void)
{
	int a[MAX][MAX], i, j, n, start, end;

	printf("Enter the value of n :  ");
	scanf("%d", &n);

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

	for (start = 0, end = n - 1; start <= end; start++, end--)
	{
		for (i = start; i <= end; i++)
			printf("%d ", a[start][i]);
		for (i = start + 1; i <= end; i++)
			printf("%d ", a[i][end]);
		for (i = end - 1; i >= start; i--)
			printf("%d ", a[end][i]);
		for (i = end - 1; i >= start + 1; i--)
			printf("%d ", a[i][start]);
	}
	return 0;
}