Langston's Ant, animated for POSIX

Synopsis

Performs a simulation of Langston's Ant as an animation for Linux, Un*x systems.

Notes

There are no borders, the map wraps edge to edge. Define statements have a 20x20 grid, 1000 steps and a delay of 20ms. The ANT always starts at, or near, the center. The ant defaults being oriented towards north as an initial condition.

Compilation

gcc -o Ant Ant.c

Code

  1 #include<stdio.h>
  2 #include<stdlib.h>
  3 #include <time.h>
  4 #include <errno.h> 
  5 #define X 20
  6 #define Y 20
  7 #define S 1000
  8 #define D 20
  9 #include <time.h>
 10 #include <errno.h>    
 11 
 12 /* msleep(): Sleep for the requested number of milliseconds. */
 13 int msleep(long msec)
 14 {
 15 	struct timespec ts;
 16 	int res;
 17 
 18 	if (msec < 0)
 19 	{
 20 		errno = EINVAL;
 21 		return -1;
 22 	}
 23 
 24 	ts.tv_sec = msec / 1000;
 25 	ts.tv_nsec = (msec % 1000) * 1000000;
 26 
 27 	do
 28 	{
 29 		res = nanosleep(&ts, &ts);
 30 	}
 31 	while (res && errno == EINTR);
 32 	return res;
 33 }
 34 
 35 void main(void)
 36 {
 37 	char world[X][Y];
 38 	unsigned short x, y, c, d, h, s;
 39 	//init
 40 	x=X/2; y=Y/2; h=0;
 41 	for(c=0;c<Y;c++)
 42 	{
 43 		for(d=0;d<X;d++)
 44 		{
 45 			world[d][c] = '.';
 46 		}
 47 	}
 48 
 49 	//loop
 50 	for(s=0;s<S;s++)
 51 	{
 52 		#ifdef D
 53 		msleep(D);
 54 		#endif
 55 		printf("\e[1;1H\e[2J");
 56 		//print current state
 57 		printf("S=%d\n\n",s+1);
 58 		printf("%c", '/');
 59 		for(c=0;c<X;c++)
 60 		{
 61 			printf("%c", '-');
 62 		}
 63 		printf("%c\n", '\\');
 64 		for(c=0;c<Y;c++)
 65 		{
 66 			printf("%c", '|');
 67 			for(d=0;d<X;d++)
 68 			{
 69 				if(d==x && c==y)
 70 					printf("A");
 71 				else
 72 					printf("%c",world[d][c]);
 73 			}
 74 			printf("%c\n", '|');
 75 		}
 76 		printf("%c", '\\');
 77 		for(c=0;c<X;c++)
 78 		{
 79 			printf("%c", '-');
 80 		}
 81 		printf("/\n\n");
 82 		//turn logic
 83 		if(world[x][y]=='.')
 84 		{
 85 			h++; //CW
 86 			h = h % 4;
 87 			world[x][y]='*';
 88 		}
 89 		else
 90 		{	
 91 			h--; //CCW
 92 			h= h % 4;
 93 			world[x][y]='.';
 94 		}
 95 		//move forward
 96 		if(h==0)
 97 			{if(y==0) y=Y-1; else y--;}
 98 		if(h==2)
 99 			{if(y==Y-1) y=0; else y++;}
100 		if(h==1)
101 			{if(x==X-1) x=0; else x++;}
102 		if(h==3)
103 			{if(x==0) x=X-1; else x--;}
104 	}
105 
106 	//terminate
107 	printf("\nEOS \n");
108 	return;
109 }