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今天更新栈
栈其实还蛮简单的,接口函数的实现也主要用的都是前面学过的知识,顺序表那块。
至于什么是栈,看一下百度定义就好,本文重点实现接口函数
- #pragma once
- #include <stdio.h>
- #include <assert.h>
- #include <stdlib.h>
- #include <stdbool.h>
-
- //#define N 10
- //typedef int STDataType;
- //typedef struct Stack
- //{
- // STDataType a[N];
- // int top;
- //}ST;
- //我们不使用静态的栈
-
-
- typedef int STDataType;
- typedef struct Stack
- {
- STDataType* a;
- int top;
- int capacity;
- }ST;//栈的元素定义
-
- void StackInit(ST* ps);//初始化
- void StackDestroy(ST* ps);//销毁栈
- void StackPush(ST* ps, STDataType x);//入栈
- void StackPop(ST* ps);//出栈
- STDataType StackTop(ST* ps);//取栈顶元素
- bool StackEmpty(ST* ps);//判断栈是否为空
- int StackSize(ST* ps);//栈的大小
-
- void StackInit(ST* ps)
- {
- assert(ps);
- ps->a = NULL;
- ps->top = ps->capacity = 0;
- }
- void StackDestroy(ST* ps)
- {
- assert(ps);
- free(ps->a);
- ps->a = NULL;
- ps->top = ps->capacity = 0;
-
- }
- void StackPush(ST* ps, STDataType x)
- {
- //判断容量,不够增容
- assert(ps);
- if (ps->top == ps->capacity)
- {
- int newcapacity = ps->capacity == 0 ? 4 : ps->capacity * 2;
- STDataType* tmp = (STDataType*)realloc(ps->a, sizeof(STDataType*) * newcapacity);
- if (tmp == NULL)
- {
- printf("realloc fail");
- exit(-1);
- }
- ps->a = tmp;
- ps->capacity = newcapacity;
- }
- //插入
- 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));
-
-
- return ps->a[ps->top--];
- }
- int StackSize(ST* ps)
- {
- assert(ps);
-
- return ps->top;
- }
- bool StackEmpty(ST* ps)
- {
- assert(ps);
- return ps->top == 0;
- }
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