#include"Seqlist1228.h"
void slprint(SL* ps)
{
	for (int i = 0; i < ps->size; i++)
	{
		printf("%d ", ps->a[i]);
	}
	printf("\n");
}



void seqlistinit(SL* ps)
{
	ps->a = NULL;
	ps->size = ps->capacity = 0;
}


void seqlistpushback(SL* ps, sldatatype x)
{

	
	
	//如果无空间或者空间不足，那么就扩容
	if (ps->size == ps->capacity)//是否扩容的条件
	{
		int newcapacity = ps->capacity == 0 ? 4 : ps->capacity * 2;


		sldatatype* tmp = realloc(ps->a, newcapacity * sizeof(sldatatype));
		
		
		if (tmp == NULL)//realloc失败
		{
			printf("realloc fail\n");
			exit(-1);
		}



		//realloc成功了
		ps->a = tmp;//把申请到的空间给  a
		ps->capacity = newcapacity;//  容量给扩容后的容量
	}




	//插入数据
	ps->a[ps->size] = x;
	ps->size++;
	/*ps->a[ps -> size] = x;
	ps->size++;直接插入*/

}//尾插




void seqlistpopback(SL* ps);//尾删
void seqlistpushfront(SL* ps, sldatatype x);//头插
void seqlistpopfront(SL* ps);//头删