//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;
}
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