More examples

examples/hanoi.c

@@ -0,0 +1,73 @@
+#define V int
+#define PFX stk
+#define SNAME stack
+#define CMC_EXT_INIT
+#include "cmc/stack.h"
+
+const int disks = 6;
+
+struct
+{
+    struct stack *from;
+    struct stack *aux;
+    struct stack *to;
+} print_aux = { NULL };
+
+void print_stacks()
+{
+    for (int i = 9; i >= 0; i--)
+    {
+        int ia = print_aux.from->buffer[i];
+        int ib = print_aux.aux->buffer[i];
+        int ic = print_aux.to->buffer[i];
+
+        printf("| %c | %c | %c |\n", ia == 0 ? 32 : ia + 48, ib == 0 ? 32 : ib + 48, ic == 0 ? 32 : ic + 48);
+    }
+
+    printf("+---+---+---+\n\n");
+}
+
+void move(struct stack *from, struct stack *to)
+{
+    stk_push(to, stk_top(from));
+
+    stk_pop(from);
+}
+
+void hanoi(int n, struct stack *from, struct stack *aux, struct stack *to)
+{
+    if (n == 0)
+        return;
+
+    hanoi(n - 1, from, to, aux);
+
+    move(from, to);
+
+    print_stacks();
+
+    hanoi(n - 1, aux, from, to);
+}
+
+int main()
+{
+    struct stack from = stk_init(10, &(struct stack_fval){ NULL });
+    struct stack to = stk_init(10, &(struct stack_fval){ NULL });
+    struct stack aux = stk_init(10, &(struct stack_fval){ NULL });
+
+    for (int i = disks; i >= 1; i--)
+        stk_push(&from, i);
+
+    print_aux.from = &from;
+    print_aux.aux = &aux;
+    print_aux.to = &to;
+
+    print_stacks();
+
+    hanoi(stk_count(&from), &from, &aux, &to);
+
+    stk_release(from);
+    stk_release(to);
+    stk_release(aux);
+
+    return 0;
+}