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Langton's ant: Difference between revisions
→{{header|C}}
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The problem has recieved some analysis, for more details, please take a look at the Wikipedia article.
=={{header|C}}==
Requires ANSI terminal.
<lang c>#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int w = 0, h = 0;
unsigned char *pix;
void refresh(int x, int y)
{
int i, j, k;
printf("\033[H");
for (i = k = 0; i < h; putchar('\n'), i++)
for (j = 0; j < w; j++, k++)
putchar(pix[k] ? '#' : ' ');
}
void walk()
{
int dx = 0, dy = 1, i, k;
int x = w / 2, y = h / 2;
pix = calloc(1, w * h);
printf("\033[H\033[J");
while (1) {
i = (y * w + x);
if (pix[i]) k = dx, dx = -dy, dy = k;
else k = dy, dy = -dx, dx = k;
pix[i] = !pix[i];
printf("\033[%d;%dH%c", y + 1, x + 1, pix[i] ? '#' : ' ');
x += dx, y += dy;
printf("\033[%d;%dH\033[31m@\033[m", y + 1, x + 1);
k = 0;
if (x < 0) {
memmove(pix + 1, pix, w * h - 1);
for (i = 0; i < w * h; i += w) pix[i] = 0;
x++, k = 1;
}
else if (x >= w) {
memmove(pix, pix + 1, w * h - 1);
for (i = w-1; i < w * h; i += w) pix[i] = 0;
x--, k = 1;
}
if (y >= h) {
memmove(pix, pix + w, w * (h - 1));
memset(pix + w * (h - 1), 0, w);
y--, k = 1;
}
else if (y < 0) {
memmove(pix + w, pix, w * (h - 1));
memset(pix, 0, w);
y++, k = 1;
}
if (k) refresh(x, y);
fflush(stdout);
usleep(10000);
}
}
int main(int c, char **v)
{
if (c > 1) w = atoi(v[1]);
if (c > 2) h = atoi(v[2]);
if (w < 40) w = 40;
if (h < 25) h = 25;
walk();
return 0;
}</lang>
=={{header|Processing}}==
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