C语言笔记25 •顺序表介绍•

// SeqList.h 
 
#pragma once
#include 
#include 
#include 
 
typedef int SLDataType;
typedef struct SeqList
{
	SLDataType* arr;
	int size;
	int capacity;
 
}SL;
//typedef struct SeqList SL;
 
//顺序表初始化
void SLInit(SL* ps);
//顺序表销毁头部插入
void SLDestroy(SL* ps);
 
//数据打印
void SLprint(SL sl);
 
//插入数据之前先看空间够不够
void SLCheckCapacity(SL* ps);
 
//尾部插入&头部插入
//尾部插入
void SLPushback(SL* ps, SLDataType x);
//头部插入
void SLPushFront(SL* ps, SLDataType x);
 
//尾部删除&头部删除
//尾部删除
void SLPopBack(SL* ps);
//头部删除
void SLPopFront(SL* ps);

//SeqList.c
 
#define _CRT_SECURE_NO_WARNINGS 1
#include "SeqList.h"
 
//顺序表初始化
void SLInit(SL* ps)
{
	ps->arr = NULL;
	ps->size = 0;
	ps->capacity = 0;
}
//顺序表销毁
void SLDestroy(SL* ps)
{
	if (ps->arr)
	{
		free(ps->arr);
	}
	ps->arr = NULL;
	ps->size = 0;
	ps->capacity = 0;
}
 
//插入数据之前先看空间够不够
void SLCheckCapacity(SL* ps)
{
	if (ps->capacity == ps->size)//空间不够了  需要申请内存
	{
		int Newcapacity = ps->capacity == 0 ? 4 : 2 * ps->capacity;
		SLDataType* temp = realloc(ps->arr, Newcapacity * sizeof(SLDataType));
		if (temp == NULL)
		{
			perror("realloc");
			exit(1);
			//return 1;
		}
		ps->arr = temp;//内存申请成功
		ps->capacity = Newcapacity;
	}
}
//数据打印
void SLprint(SL sl)
{
	for (int i = 0; i < sl.size; i++)
	{
		printf("%d ", sl.arr[i]);
	}
	printf("\n");
}
//尾部插入
void SLPushback(SL* ps, SLDataType x)
{
	assert(ps);
	SLCheckCapacity(ps);
	//ps->arr[ps->size] = x;
	//++ps->size;
	ps->arr[ps->size++] = x;
}
//头部插入
void SLPushFront(SL* ps, SLDataType x)
{
	assert(ps);
	SLCheckCapacity(ps);
	//先让顺序表中已有的数据整体往后挪动一位
	for (int i = ps->size;i>0; i--)
	{
		ps->arr[i] = ps->arr[i - 1];//arr[1]=arr[0]
	}
	ps->arr[0] = x;
	ps->size++;//长度+1
}
 
//尾部删除
void SLPopBack(SL* ps)
{
	assert(ps);
	ps->size--;//--ps->size
}
//头部删除
void SLPopFront(SL* ps)
{
	assert(ps);
	for (int i = 0; i < ps->size - 1; i++)
	{
		ps->arr[i] = ps->arr[i + 1];
	}
	ps->size--;
}

//SeqList-test.c
 
 
#define _CRT_SECURE_NO_WARNINGS 1
#include"SeqList.h"
 
 
void test()
{
	SL sl;
	SLInit(&sl);//初始化
 
	SLPushback(&sl, 1);//尾插一个数字1
	SLPushback(&sl, 2);//尾插一个数字1
	SLPushback(&sl, 3);//尾插一个数字1
	SLPushback(&sl, 4);//尾插一个数字1
	SLprint(sl);//1 2 3 4
 
	SLPushFront(&sl, 0); //头插一个数字0
	SLprint(sl);//0 1 2 3 4
 
	SLPopBack(&sl);//尾删一个数字
	SLprint(sl);//0 1 2 3 
 
	SLPopFront(&sl);//头删一个数字
	SLprint(sl);//1 2 3 
 
	SLDestroy(&sl);
}
 
int main()
{
	test();
 
	return 0;
}