#define _CRT_SECURE_NO_WARNINGS 1


#include "Stack.h"


void StackInit(ST* ps)
{
	ps->a = (STDataType*)malloc(sizeof(STDataType)*4);
	if (ps->a == NULL)
	{
		printf("relloc fail\n");
		exit(-1);
	}
	ps->capacoty = 4;
	ps->top = 0;

}
void StackDestory(ST* ps)
{
	assert(ps);
	free(ps->a);
	ps->a = NULL;
	ps->top = ps->capacoty = 0;
}

//入栈
void StackPush(ST* ps, STDataType x)
{
	assert(ps);


	//满了
	if (ps->top == ps->capacoty) {
		STDataType* tmp = realloc(ps->a, ps->capacoty * 2 * sizeof(STDataType));
		if (tmp == NULL)
		{
			printf("relloc fail\n");
			exit(-1);
		}
		else {
			ps->a = tmp;
			ps->capacoty *= 2;
		}
	}
	ps->a[ps->top] = x;
	ps->top++;
}

//出栈
void StackPop(ST* ps)
{
	assert(ps);

	//栈空了，调用Top，直接中止程序报错
	assert(ps->top > 0);

		//top减一
		ps->top--;
}

STDataType StackTop(ST* ps)
{
	assert(ps);
	assert(ps->top > 0);
	return ps->a[ps->top - 1];
}

int StackSize(ST* ps)
{
	assert(ps);
	return ps->top;


}

bool StackEmpty(ST* ps) {
	assert(ps);

	return ps->top == 0;
}