init

The-Nook-GamesTM/Proficiencies/stack.c

@@ -0,0 +1,36 @@
+#include "stack.h"
+
+struct stack *stack_push(struct stack *s, struct expression_element e)
+{
+    struct stack *new = malloc(sizeof(struct stack));
+    new->next = NULL;
+    new->data = e;
+    if (s == NULL)
+        return new;
+    new->next = s;
+    return new;
+}
+
+struct stack *stack_pop(struct stack *s)
+{
+    if (!s)
+        return NULL;
+    struct stack *next = s->next;
+    free(s);
+    return next;
+}
+
+void stack_destroy(struct stack **s)
+{
+    if(!s)
+        return;
+    while (*s)
+    {
+        *s = stack_pop(*s);
+    }
+}
+
+struct expression_element stack_peek(struct stack *s)
+{
+    return s->data;
+}