Add Hanoi C example.

2/SAD/hanoi.c

@@ -0,0 +1,33 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+void print_hanoi(int n)
+{
+	if(n == 2)
+	{
+		printf("1\n2\n1\n");
+	}
+	else
+	{
+		print_hanoi(n-1);
+		printf("%d\n", n);
+		print_hanoi(n-1);
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	if (argc != 2)
+	{
+		fprintf(stderr, "Give me a number!!!\n");
+		return EXIT_FAILURE;
+	}
+	int n = atoi(argv[1]);
+	if (n < 2)
+	{
+		fprintf(stderr, "Number must be greater than 1!\n");
+		return EXIT_FAILURE;
+	}
+	print_hanoi(n);
+	return EXIT_SUCCESS;
+}