c语言 栈的实现顺序表实现

//Stack.h

#pragma once
#include<stdio.h>
#include<stdlib.h>
#include<assert.h>
#include<stdbool.h>

typedef int STDataType;
typedef struct Stack
{
	STDataType* a;
	int top;
	int capacity;
}ST;

void StackInit(ST* ps);
void StackDestroy(ST* ps);
void StackPush(ST* ps, STDataType x);
void StackPop(ST* ps);

STDataType StackTop(ST* ps);
bool StackEmpty(ST* ps);
int StackSize(ST* ps);

//Stack.c

#include"Stack.h"

void StackInit(ST* ps)
{
	assert(ps);
	ps->a = NULL;
	ps->capacity = ps->top = 0;
}

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

void StackPush(ST* ps,STDataType x)
{
	assert(ps);
	if (ps->top == ps->capacity)
	{
		int newCapacity = ps->capacity == 0 ? 4 : 2 * ps->capacity;
		//扩容
		STDataType* tmp = (STDataType*)realloc(ps->a, sizeof(STDataType) * newCapacity);
		if (tmp == NULL)
		{
			perror("realloc fail");
			exit(-1);
		}
		ps->a = tmp;
		ps->capacity = newCapacity;
	}
	ps->a[ps->top] = x;
	ps->top++;
}

void StackPop(ST* ps)
{
	assert(ps);
	assert(!StackEmpty(ps));
	
	ps->top--;
}

STDataType StackTop(ST* ps)
{
	assert(ps);
	assert(!StackEmpty(ps));
	//注意top的位置
	return ps->a[ps->top - 1];
}

bool StackEmpty(ST* ps)
{
	assert(ps);
	return ps->top == 0;
}

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