test.c
#define _CRT_SECURE_NO_WARNINGS 1
#include"SeqList.h"

void SeqListTest1()
{
	SL S1;
	SeqListInit(&S1);
	SeqListPushBack(&S1,1);
	SeqListPushBack(&S1, 2);
	SeqListPushBack(&S1, 3);
	SeqListPushBack(&S1, 4);
	SeqListPushBack(&S1, 5);
	SeqListPrint(&S1);

}

int main()
{
	SeqListTest1();

}


SeqList.c

#define _CRT_SECURE_NO_WARNINGS 1
#include"SeqList.h"
void SeqListInit(SL* ps)
{
	ps->a = NULL;
	ps->size = ps->capatify = 0;
}
void SeqListPushBack(SL* ps,SLDataType x)
{
	if (ps->size == ps->capatify)
	{
		int newcapatify = ps->capatify == 0 ? 4 : ps->capatify * 2;
		SLDataType* tmp = (SLDataType*)realloc(ps->a, newcapatify * sizeof(SLDataType));
		if (tmp == NULL)
		{
			printf("realloc fail\n");
			exit(-1);
		}
		ps->a = tmp;
		ps->capatify = newcapatify;

	}
	ps->a[ps->size] = x;
	ps->size++;
}
void SeqListPrint(SL* ps)
{
	for (int i = 0; i < ps->size; ++i)
	{
		printf("%d ", ps->a[i]);
	}
	printf("\n");
}
void SeqDestory(SL* ps)
{
	free(ps->a);
	ps->a = NULL;
}





SeqList.h


#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#pragma once
#define N 1000
typedef int SLDataType;

typedef struct SeqList
{
	SLDataType* a;
	int size;
	int capatify;
}SL;

void SeqListInit(SL* ps);
void SeqListPushBack(SL* ps);
void SeqListPrint(SL* ps);
void SeqDestory(SL* ps);