动态顺序表实现栈：顺序栈

一、顺序栈的结构定义

//顺序栈的结构定义
typedef int STDataType;

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

二、顺序栈的初始化

//顺序栈的初始化
void STInit(ST* pst)
{
	assert(pst);
	pst->a = NULL;
	pst->top = 0;//top指针指向栈顶元素的下一位
	pst->capacity = 0;//顺序栈的容量
}

三、顺序栈的打印

//顺序栈的打印
void STPrint(ST pst)
{
	for (int i = 0; i < pst.top; i++)
	{
		printf("%d ", pst.a[i]);
	}
	printf("\n");
}

四、顺序栈的入栈

//顺序栈的入栈
void STPush(ST* pst, STDataType x)
{
	assert(pst);
	//检查扩容
	if (pst->top == pst->capacity)
	{
		int newcapacity = pst->capacity == 0 ? 4 : 2 * pst->capacity;
		STDataType* p = (STDataType*)realloc(pst->a, newcapacity * sizeof(STDataType));
		if (p == NULL)
		{
			perror("realloc fail");
			exit(-1);
		}
		else
		{
			pst->a = p;
			pst->capacity = newcapacity;
		}
	}

	pst->a[pst->top++] = x;
}

五、顺序栈的出栈

//顺序栈出栈
void STPop(ST* pst)
{
	assert(pst);
	assert(pst->top > 0);
	pst->top--;
}

六、求顺序栈栈顶元素

//求顺序栈栈顶元素
STDataType STTop(ST* pst)
{
	assert(pst);
	assert(pst->top > 0);
	return pst->a[pst->top - 1];
}

七、顺序栈判空

//顺序栈判空
bool STEmpty(ST* pst)
{
	assert(pst);
	return pst->top == 0;
}

八、顺序栈销毁

//顺序栈销毁
void STDestroy(ST* pst)
{
	assert(pst);
	if (pst->a != NULL)
	{
		free(pst->a);
		pst->a = NULL;
		pst->top = 0;
		pst->capacity = 0;
	}
}

九、测试代码

void test01()
{
    //定义顺序栈
    ST st;
    //初始化顺序栈
    STInit(&st);
    //顺序栈入栈
    STPush(&st, 1);
    STPush(&st, 2);
    STPush(&st, 3);
    STPush(&st, 4);
    STPush(&st, 5);
    //顺序栈打印
    STPrint(st);
    //顺序栈出栈
    STPop(&st);
    STPop(&st);
    STPop(&st);
    //顺序栈打印
    STPrint(st);
    //打印栈顶元素
    printf("%d\n", STTop(&st));
    //顺序栈判空
    if (STEmpty(&st))
        printf("空\n");
    else
        printf("非空\n");
    //顺序栈出栈
    STPop(&st);
    STPop(&st);
    //顺序栈判空
    if (STEmpty(&st))
        printf("空\n");
    else
        printf("非空\n");
    //顺序栈销毁
    STDestroy(&st);
}

int main()
{
    test01();
    return 0;
}