First commit

stack.c

@@ -0,0 +1,63 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+typedef struct {
+	void** data;
+	int top_index;
+	int capacity;
+	int curr_size;
+} Stack;
+
+Stack* new_stack(int stack_size) {
+	Stack* stack = malloc(sizeof(Stack));
+	stack->capacity = stack_size;
+	stack->data = malloc(stack_size);
+	stack->top_index = 0;
+	stack->curr_size = 0;
+	return stack;
+}
+
+void push(Stack* stack,void* element) {
+	if (stack->curr_size >= stack->capacity-1) {
+		stack->data = realloc(stack->data, stack->capacity*2);
+		stack->capacity *= 2;
+	}
+	*(stack->data + stack->top_index) = element;
+	printf("Adding to index %d\n",stack->top_index);
+	stack->top_index++;
+	stack->curr_size++;
+	return;
+}
+
+void* pop(Stack* stack) {
+	stack->top_index--;
+	void* to_return = *(stack->data + stack->top_index);
+	*(stack->data + stack->top_index) = NULL;
+
+	stack->curr_size--;
+
+	return to_return;
+}
+
+void* peek(Stack* stack) {
+	void* to_return = *(stack->data + stack->top_index - 1);
+	return to_return;
+}
+
+int size(Stack* stack) {
+	return (stack->curr_size);
+}
+
+void main() {
+	Stack* stack = new_stack(10);
+	int a = 2;
+	int b = 3;
+	int c = 4;
+	push(stack,(void *)&a);
+	push(stack,(void *)&b);
+	push(stack,(void *)&c);
+	printf("%d\n",*( (int *) pop(stack)));
+	printf("%d\n",*( (int *) pop(stack)));
+	printf("%d\n",*( (int *) pop(stack)));
+//	printf("%d\n",size(stack));
+}