1、首先定义结构体：

typedef int Seqdata;

typedef struct SeqList
{
	Seqdata* data;
	int sz;
	int capacity;
}SeqList;

	SeqList s;    //定义结构体

2、初始化结构体：

	SeqListInit(&s);  //初始化结构体

注意：这里为清晰，分为2个源文件，1个头文件操作

//初始化结构体
void SeqListInit(SeqList* pa)
{
	assert(pa);

	pa->data = NULL;
	pa->sz = pa->capacity = 0;
}

3、从结尾插入数值：

	SeqListPushBack(&s, 1);


//尾插
void SeqListPushBack(SeqList* pa, Seqdata x)
{
	assert(pa);
	
	SeqListFounded(pa);

	pa->data[pa->sz] = x;
	pa->sz++;

}

这里我们需要检查扩容，所以设置一个扩容函数：SeqListFounded()

//动态扩容
void SeqListFounded(SeqList* pa)
{
	if (pa->sz == pa->capacity)
	{
		int new_capacity = pa->capacity == 0 ? 4 : pa->capacity * 2; //三目运算符

		Seqdata* new_data = (Seqdata*)realloc(pa->data, new_capacity * sizeof(Seqdata));
		if (NULL == new_data)   //判断空指针
		{
			perror("Founded");
			exit(-1);
		}

		pa->data = new_data;
		pa->capacity = new_capacity;
	}

}

4、从头部插入数值：

void SeqListPushFront(SeqList* pa, Seqdata x)
{
	assert(pa);

	SeqListFounded(pa);

	int ret = pa->sz - 1;  //因为是下标所以要-1
	while (ret >= 0)
	{
		pa->data[ret + 1] = pa->data[ret];
		ret--;
	}
	pa->data[0] = x;
	pa->sz++;

}

5、从尾部删除数值：

//尾删
void SeqListPopBack(SeqList* pa)
{
	assert(pa);

	//直接--sz，隐藏即可，不用变为0；
	if (pa->sz != 0)
		pa->sz--;

}

6、从头部删除数值：

//头删
void SeqListPopFront(SeqList* pa)
{
	assert(pa);

	int ret = 0;
	if (pa->sz != 0)  //没有数时不删
	{
		while (ret < pa->sz - 1)  //从后往前移
		{
			pa->data[ret] = pa->data[ret + 1];
			ret++;
		}
		pa->sz--;  //覆盖掉最后一个数
	}

}

7、结尾释放空间：

//释放空间
void SeqListDistory(SeqList* pa)
{
	assert(pa);

	free(pa->data);
	pa->data = NULL;
	pa->capacity = 0;
	pa->sz = 0;
}

下面是全部代码：test.c

#include "seqlist.h"

void test()
{
	SeqList s;    //定义结构体
	SeqListInit(&s);  //初始化结构体

	//尾插
	SeqListPushBack(&s, 1);
	SeqListPushBack(&s, 2);
	SeqListPushBack(&s, 3);
	SeqListPushBack(&s, 4);
	SeqListPushBack(&s, 5);
	//头插
	SeqListPushFront(&s, 5);
	SeqListPushFront(&s, 4);
	SeqListPushFront(&s, 3);
	//尾删
	SeqListPopBack(&s);
	SeqListPopBack(&s);
	//头删
	SeqListPopFront(&s);
	SeqListPopFront(&s);

	PrintSeqList(&s);

	SeqListDistory(&s);  //释放空间
	
}


int main()
{
	test();

	return 0;
}

seqlist.h

#pragma once

#include <stdio.h>
#include <assert.h>
#include <stdlib.h>


typedef int Seqdata;

typedef struct SeqList
{
	Seqdata* data;
	int sz;
	int capacity;
}SeqList;

//头插尾插
void SeqListPushBack(SeqList* pa, Seqdata x);
void SeqListPushFront(SeqList* pa, Seqdata x);

//头删尾删
void SeqListPopBack(SeqList* pa);
void SeqListPopFront(SeqList* pa);

//创建、初始化、销毁空间
void SeqListFounded(SeqList* pa);
void SeqListInit(SeqList* pa);
void SeqListDistory(SeqList* pa);

//打印
void PrintSeqList(SeqList* pa);

seqlist.c

#include "seqlist.h"


//初始化结构体
void SeqListInit(SeqList* pa)
{
	assert(pa);

	pa->data = NULL;
	pa->sz = pa->capacity = 0;
}

//释放空间
void SeqListDistory(SeqList* pa)
{
	assert(pa);

	free(pa->data);
	pa->data = NULL;
	pa->capacity = 0;
	pa->sz = 0;
}

//动态扩容
void SeqListFounded(SeqList* pa)
{
	if (pa->sz == pa->capacity)
	{
		int new_capacity = pa->capacity == 0 ? 4 : pa->capacity * 2; //三目运算符

		Seqdata* new_data = (Seqdata*)realloc(pa->data, new_capacity * sizeof(Seqdata));
		if (NULL == new_data)   //判断空指针
		{
			perror("Founded");
			exit(-1);
		}

		pa->data = new_data;
		pa->capacity = new_capacity;
	}

}

//尾插
void SeqListPushBack(SeqList* pa, Seqdata x)
{
	assert(pa);
	
	SeqListFounded(pa);

	pa->data[pa->sz] = x;
	pa->sz++;

}

//头插
void SeqListPushFront(SeqList* pa, Seqdata x)
{
	assert(pa);

	SeqListFounded(pa);

	int ret = pa->sz - 1;  //因为是下标所以要-1
	while (ret >= 0)
	{
		pa->data[ret + 1] = pa->data[ret];
		ret--;
	}
	pa->data[0] = x;
	pa->sz++;

}

//打印顺序表
void PrintSeqList(SeqList* pa)
{
	int i = 0;
	for (i = 0; i < pa->sz; i++)
	{
		printf("%d ", pa->data[i]);
	}

}

//尾删
void SeqListPopBack(SeqList* pa)
{
	assert(pa);

	//直接--sz，隐藏即可，不用变为0；
	if (pa->sz != 0)
		pa->sz--;

}

//头删
void SeqListPopFront(SeqList* pa)
{
	assert(pa);

	int ret = 0;
	if (pa->sz != 0)  //没有数时不删
	{
		while (ret < pa->sz - 1)  //从后往前移
		{
			pa->data[ret] = pa->data[ret + 1];
			ret++;
		}
		pa->sz--;  //覆盖掉最后一个数
	}

}