顺序表的实现

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之前我们学习了顺序表的有关知识

这篇文章我们学习一下顺序表的接口实现

同样我们创建SeqList.h SeqList.c test.c三个文件来实现功能

1.创建顺序表

2.基本的增删查改接口

2.1顺序表初始化

顺序表的初始化我们只需要讲指针置为空指针
然后将当前数据元素个数和最大数据元素个数置为0
到插入时我们便会动态开辟空间给指针a

//顺序表的初始化
void SLInit(SL* ps)
{
	ps->a = NULL;//置为空指针
	ps->size = 0;//数据个数为0
	ps->capacity = 0;//空间大小置为0
}

2.2顺序表的销毁

//顺序表的销毁
void SLDestroy(SL* ps)
{
	if (ps->a != NULL)
	{
		free(ps->a);
		ps->a = NULL;
		ps->size = 0;
		ps->capacity = 0;
	}
}

2.3检查顺序表的容量

//检查顺序表的容量
void SLCheckCapacity(SL* ps)
{
	if (ps->size == ps->capacity)
	{
		int newCapacity = ps->capacity = 0 ? 4 : ps->capacity * 2;
		SLDataType* tmp = realloc(ps->a, sizeof(SLDataType) * newCapacity);
		if (tmp == NULL)
		{
			perror("realloc fail");
			return;
		}
		ps->a = tmp;
		ps->capacity = newCapacity;
	}
}

2.4打印顺序表 

//打印顺序表
void SLPrint(SL* ps)
{
	for (int i = 0; i < ps->size; i++)
	{
		printf("%d ", ps->a[i]);
	}
	printf("\n");
}

2.5顺序表的尾插

//顺序表的尾插
void SLPushBack(SL* ps, SLDataType x)
{
	SLCheckCapacity(ps);
	ps->a[ps->size] = x;
	ps->size++;
}

2.6顺序表的头插

//顺序表的头插
void SLPushFront(SL* ps, SLDataType x)
{
	SLCheckCapacity(ps);
	int end = ps->size - 1;
	while (end >= 0)
	{
		ps->a[end + 1] = ps->a[end];
	}
	ps->a[0] = x;
	ps->size++;
}

2.7顺序表的尾删

//顺序表的尾删
void SLPopBack(SL* ps)
{
	assert(ps->size > 0);
	//ps->a[ps->size - 1] = -1;
	ps->size--;
}

2.8顺序表的头删

//顺序表的头删
void SLPopFront(SL* ps)
{
	//for (int i = 0; i < ps->size; i++)
	//{
	//	ps->a[i] = ps->a[i + 1];
	//}
	//ps->size--;
	assert(ps);
	assert(ps->size > 0);
	int begin = 1;
	while (begin < ps->size)
	{
		ps->a[begin - 1] = ps->a[begin];
		++begin;
	}
	ps->size--;
}

2.9任意位置的插入

//任意位置的插入
void SLInsert(SL* ps, int pos, SLDataType x)
{
	assert(ps);
	assert(pos >= 0 && pos <= ps->size);
    SLCheckCapacity(ps);
	int end = ps->size - 1;
	while (end >= pos)
	{
		ps->a[end + 1] = ps->a[end];
		--end;
	}
	ps->a[pos] = x;
	ps->size++;
}

2.10任意位置的删除

//任意位置的删除
void SLErase(SL* ps, int pos)
{
	assert(ps);
	assert(pos >= 0 && pos <= ps->size);
	int begin = pos;
	while (begin < ps->size)
	{
		ps->a[begin] = ps->a[begin+1];
		++begin;
	}
	ps->size--;
}

2.11顺序表的查找

//顺序表的查找
//找到返回下标，找不到返回-1
int SLFind(SL* ps, SLDataType x)
{
	assert(ps);
	for (int i = 0; i < ps->size; i++)
	{
		if (ps->a[i] == x)
		{
			return i;
		}
	}
	return -1;
}

3.总代码

SeqList.h

#pragma once
#include 
#include 
#include 
typedef int SLDataType;
//顺序表的动态存储
typedef struct SeqList
{
	SLDataType* a;     //指向动态开辟的数组
	int size;           //有效元素个数
	int capacity;       //容量空间的大小
}SL;

//顺序表的初始化
void SLInit(SL* ps);
//顺序表的销毁
void SLDestroy(SL* ps);

//检查顺序表的容量
void SLCheckCapacity(SL* ps);
//打印顺序表
void SLPrint(SL* ps);


//顺序表的尾插
void SLPushBack(SL* ps, SLDataType x);
//顺序表的头插
void SLPushFront(SL* ps, SLDataType x);
//顺序表的尾删
void SLPopBack(SL* ps);
//顺序表的头删  
void SLPopFront(SL* ps);

//任意位置的插入
void SLInsert(SL* ps, int pos, SLDataType x);
//任意位置的删除
void SLErase(SL* ps, int pos);

//顺序表的查找
//找到返回下标，找不到返回-1
int SLFind(SL* ps, SLDataType x);

SeqList.c

#define _CRT_SECURE_NO_WARNINGS 1
#include "SeqList.h"

//顺序表的初始化
void SLInit(SL* ps)
{
	ps->a = NULL;//置为空指针
	ps->size = 0;//数据个数为0
	ps->capacity = 0;//空间大小置为0
}
//顺序表的销毁
void SLDestroy(SL* ps)
{
	if (ps->a != NULL)
	{
		free(ps->a);
		ps->a = NULL;
		ps->size = 0;
		ps->capacity = 0;
	}
}
//检查顺序表的容量
void SLCheckCapacity(SL* ps)
{
	if (ps->size == ps->capacity)
	{
		int newCapacity = ps->capacity == 0 ? 4 : ps->capacity * 2;
		SLDataType* tmp = realloc(ps->a, sizeof(SLDataType) * newCapacity);
		if (tmp == NULL)
		{
			perror("realloc fail");
			return;
		}
		ps->a = tmp;
		ps->capacity = newCapacity;
	}
}
//打印顺序表
void SLPrint(SL* ps)
{
	for (int i = 0; i < ps->size; i++)
	{
		printf("%d ", ps->a[i]);
	}
	printf("\n");
}
//顺序表的尾插
void SLPushBack(SL* ps, SLDataType x)
{
	SLCheckCapacity(ps);
	ps->a[ps->size] = x;
	ps->size++;
}
//顺序表的头插
void SLPushFront(SL* ps, SLDataType x)
{
	SLCheckCapacity(ps);
	int end = ps->size - 1;
	while (end >= 0)
	{
		ps->a[end + 1] = ps->a[end];
		--end;
	}
	ps->a[0] = x;
	ps->size++;
}
//顺序表的尾删
void SLPopBack(SL* ps)
{
	assert(ps->size > 0);
	//ps->a[ps->size - 1] = -1;
	ps->size--;
}
//顺序表的头删
void SLPopFront(SL* ps)
{
	//for (int i = 0; i < ps->size; i++)
	//{
	//	ps->a[i] = ps->a[i + 1];
	//}
	//ps->size--;
	assert(ps);
	assert(ps->size > 0);
	int begin = 1;
	while (begin < ps->size)
	{
		ps->a[begin - 1] = ps->a[begin];
		++begin;
	}
	ps->size--;
}
//任意位置的插入
void SLInsert(SL* ps, int pos, SLDataType x)
{
	assert(ps);
	assert(pos >= 0 && pos <= ps->size);
	SLCheckCapacity(ps);
	int end = ps->size - 1;
	while (end >= pos)
	{
		ps->a[end + 1] = ps->a[end];
		--end;
	}
	ps->a[pos] = x;
	ps->size++;
}
//任意位置的删除
void SLErase(SL* ps, int pos)
{
	assert(ps);
	assert(pos >= 0 && pos <= ps->size);
	int begin = pos;
	while (begin < ps->size)
	{
		ps->a[begin] = ps->a[begin+1];
		++begin;
	}
	ps->size--;
}
//顺序表的查找
//找到返回下标，找不到返回-1
int SLFind(SL* ps, SLDataType x)
{
	assert(ps);
	for (int i = 0; i < ps->size; i++)
	{
		if (ps->a[i] == x)
		{
			return i;
		}
	}
	return -1;
}

test.c

#define _CRT_SECURE_NO_WARNINGS 1
#include "SeqList.h"
int main()
{
	SL sl;
	SLInit(&sl);
	SLPushBack(&sl, 10);
	SLPushBack(&sl, 20);
	SLPushBack(&sl, 30);
	SLPushBack(&sl, 40);
	SLPrint(&sl);
	SLPopBack(&sl);
	SLPrint(&sl);
	SLPopFront(&sl);
	SLPrint(&sl);
	SLPushFront(&sl, 10);
	SLPrint(&sl);
	SLInsert(&sl, 1, 15);
	SLPrint(&sl);
	SLErase(&sl, 2);
	SLPrint(&sl);
	int ret1 = SLFind(&sl, 15);
	printf("%d\n", ret1);
	int ret2 = SLFind(&sl, 20);
	printf("%d\n", ret2);



	SLDestroy(&sl);
	return 0;
}

欢迎各位大佬指正！