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+/* example from http://barnyard.syr.edu/quickies/hanoi.c */
+
+/* hanoi.c: solves the tower of hanoi problem. (Programming exercise.) */
+/* By Terry R. McConnell (12/2/97) */
+/* Compile: cc -o hanoi hanoi.c */
+
+/* This program does no error checking. But then, if it's right, 
+   it's right ... right ? */
+
+
+/* The original towers of hanoi problem seems to have been originally posed
+   by one M. Claus in 1883. There is a popular legend that goes along with
+   it that has been often repeated and paraphrased. It goes something like this:
+   In the great temple at Benares there are 3 golden spikes. On one of them,
+   God placed 64 disks increasing in size from bottom to top, at the beginning
+   of time. Since then, and to this day, the priest on duty constantly transfers
+   disks, one at a time, in such a way that no larger disk is ever put on top
+   of a smaller one. When the disks have been transferred entirely to another
+   spike the Universe will come to an end in a large thunderclap.
+
+   This paraphrases the original legend due to DeParville, La Nature, Paris 1884,
+   Part I, 285-286. For this and further information see: Mathematical 
+   Recreations & Essays, W.W. Rouse Ball, MacMillan, NewYork, 11th Ed. 1967,
+   303-305.
+ *
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define TRUE 1
+#define FALSE 0
+
+/* This is the number of "disks" on tower A initially. Taken to be 64 in the
+ * legend. The number of moves required, in general, is 2^N - 1. For N = 64,
+ * this is 18,446,744,073,709,551,615 */
+#define N 4
+
+/* These are the three towers. For example if the state of A is 0,1,3,4, that
+ * means that there are three discs on A of sizes 1, 3, and 4. (Think of right
+ * as being the "down" direction.) */
+int A[N], B[N], C[N]; 
+
+void Hanoi(int,int*,int*,int*);
+
+/* Print the current configuration of A, B, and C to the screen */
+void PrintAll()
+{
+   int i;
+
+   printf("A: ");
+   for(i=0;i<N;i++)printf(" %d ",A[i]);
+   printf("\n");
+
+   printf("B: ");
+   for(i=0;i<N;i++)printf(" %d ",B[i]);
+   printf("\n");
+
+   printf("C: ");
+   for(i=0;i<N;i++)printf(" %d ",C[i]);
+   printf("\n");
+   printf("------------------------------------------\n");
+   return;
+}
+
+/* Move the leftmost nonzero element of source to dest, leave behind 0. */
+/* Returns the value moved (not used.) */
+int Move(int *source, int *dest)
+{
+   int i = 0, j = 0;
+
+   while (i<N && (source[i])==0) i++;
+   while (j<N && (dest[j])==0) j++;
+
+   dest[j-1] = source[i];
+   source[i] = 0;
+   PrintAll();       /* Print configuration after each move. */
+   return dest[j-1];
+}
+
+
+/* Moves first n nonzero numbers from source to dest using the rules of Hanoi.
+   Calls itself recursively.
+   */
+void Hanoi(int n,int *source, int *dest, int *spare)
+{
+   int i;
+   if(n==1){
+      Move(source,dest);
+      return;
+   }
+
+   Hanoi(n-1,source,spare,dest);
+   Move(source,dest);
+   Hanoi(n-1,spare,dest,source);	
+   return;
+}
+
+int main()
+{
+   int i;
+
+   /* initialize the towers */
+   for(i=0;i<N;i++)A[i]=i+1;
+   for(i=0;i<N;i++)B[i]=0;
+   for(i=0;i<N;i++)C[i]=0;
+
+   printf("Solution of Tower of Hanoi Problem with %d Disks\n\n",N);
+
+   /* Print the starting state */
+   printf("Starting state:\n");
+   PrintAll();
+   printf("\n\nSubsequent states:\n\n");
+
+   /* Do it! Use A = Source, B = Destination, C = Spare */
+   Hanoi(N,A,B,C);
+
+   return 0;
+}
+
+/* vim: set expandtab ts=4 sw=3 sts=3 tw=80 :*/