创建一个简单的栈

1.Stack.h头文件代码

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

typedef int STDataType;

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

void StackInit(ST* ps);
void StackDestory(ST* ps);
// 入栈
void StackPush(ST* ps, STDataType x);
// 出栈
void StackPop(ST* ps);
STDataType StackTop(ST* ps);
int StackSize(ST* ps);
bool StackEmpty(ST* ps);

2.Stack.c栈函数的实现

#include"Stack.h"
void StackInit(ST* ps)
{
	assert(ps);

	ps->a = (STDataType*)malloc(sizeof(STDataType) * 4);
	if (ps->a == NULL)
	{
		printf("malloc fail\n");
		exit(-1);
	}

	ps->capacity = 4;
	ps->top = 0;
}

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

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

	// 满了-》增容
	if (ps->top == ps->capacity)
	{
		STDataType* tmp = (STDataType*)realloc(ps->a, ps->capacity * 2 * sizeof(STDataType));
		if (tmp == NULL)
		{
			printf("realloc fail\n");
			exit(-1);
		}
		else
		{
			ps->a = tmp;
			ps->capacity *= 2;
		}
	}

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

// 出栈
void StackPop(ST* ps)
{
	assert(ps);
	// 栈空了，调用Pop，直接中止程序报错
	assert(ps->top > 0);

	//ps->a[ps->top - 1] = 0;
	ps->top--;
}
//打印
STDataType StackTop(ST* ps)
{
	assert(ps);
	// 栈空了，调用Top，直接中止程序报错
	assert(ps->top > 0);

	return ps->a[ps->top - 1];
}

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

3.test.c测试

#include"Stack.h"
int main()
{
	ST st;
	StackInit(&st);
	StackPush(&st, 1);
	StackPush(&st, 2);
	StackPush(&st, 3);
	StackPush(&st, 4);
	StackPush(&st, 5);
	while (!StackEmpty(&st))
	{
		printf("%d ", StackTop(&st));
		StackPop(&st);
	}
	StackDestory(&st);
	return 0;
}