zizag c

1#include <stdio.h>
2#include <stdlib.h>
3 
4int main(int c, char **v)
5{
6	int i, j, m, n, *s;
7 
8	/* default size: 5 */
9	if (c < 2 || ((m = atoi(v[1]))) <= 0) m = 5;
10 
11	/* alloc array*/
12	s = malloc(sizeof(int) * m * m);
13 
14	for (i = n = 0; i < m * 2; i++)
15		for (j = (i < m) ? 0 : i-m+1; j <= i && j < m; j++)
16			s[(i&1)? j*(m-1)+i : (i-j)*m+j ] = n++;
17 
18	for (i = 0; i < m * m; putchar((++i % m) ? ' ':'\n'))
19		printf("%3d", s[i]);
20 
21	/* free(s) */
22	return 0;
23}