/* * The Towers Of Hanoi * C * Copyright (C) 1998
Amit Singh. All Rights Reserved.
* * Tested with, ah well ... :) */
#include
#include
#include
#define FROM 1
#define TO 3
#define USING 2
void dohanoi(int N, int from, int to, int using)
{
if (N > 0)
{
dohanoi(N-1, from, using, to);
printf ("move %d --> %d\n", from, to);
dohanoi(N-1, using, to, from);
}
}
int main (int argc, char **argv)
{
long int N;
if (argc != 2)
{
fprintf(stderr, "usage: %s N\n", argv[0]);
exit(1);
}
N = strtol(argv[1], (char **)NULL, 10);
/* a bit of error checking, LONG_XXX should be there in limits.h */
if (N == LONG_MIN || N == LONG_MAX || N <= 0)
{
fprintf(stderr, "illegal value for number of disks\n");
exit(2);
}
dohanoi(N, FROM, TO, USING); exit(0);
}
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