수다닷컴

질문 제목 : 질문 내용 : 원소삭제에서 에러가 나네요.
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#include stdio.h
#include string.h
#include stdlib.h
#define true 1
#define false 0
typedef struct circlelinkedlisttype
{
int data;
struct circlelinkedlisttype* plink;
}circlelinkedlist;
typedef struct circlelistnodetype
{
int elementcount;//현재원소개수
circlelinkedlist* pheaderpointer;//헤더포인터
}circlelistnode;

circlelistnode* creaditlist(circlelistnode* plist);//헤더포인트생성
int addelement(circlelistnode* plist,int position, int data);//리스트생성
int removeelement(circlelistnode* plist,int position);//원소삭제
void displaycirclelist(circlelistnode* plist);//전체출력
int getlengt(circlelistnode* plist);//전체길이리턴
circlelinkedlist* getelement(circlelistnode* plist,int position);//현재원소리턴
void deleteheapmemory(circlelistnode* plist);//메모리해제

int main()
{
circlelistnode* plink=null;
circlelinkedlist* pelement=null;
plink=creaditlist(plink);
if(plink != null)
{
addelement(plink,0,2);
addelement(plink,1,3);
addelement(plink,2,4);
addelement(plink,0,1);
displaycirclelist(plink);

removeelement(plink,0);
displaycirclelist(plink);

deleteheapmemory(plink);
}
return 0;
}

circlelistnode* creaditlist(circlelistnode* plink) //헤더포인터 생성
{
plink=(circlelistnode*)malloc(sizeof(circlelistnode));
if(plink == null){
puts(헤더포인터 메모리 할당 오류);
return null;
}
memset(plink,0,sizeof(circlelistnode));

return plink;
}
int addelement(circlelistnode* plist,int position, int data) //헤더포인터 생성
{
int i;
int ret=false;

circlelinkedlist* pprenode=null;
circlelinkedlist* pnewnode=null;
circlelinkedlist* plastnode=null;

if(plist != null){
if(position = 0 &&
position = plist-elementcount){
pnewnode=(circlelinkedlist*)malloc(sizeof(circlelinkedlist*));
if(pnewnode==null)
{
fputs(메모리 할당 오류\n,stdout);
return ret;
}

pnewnode-data=data;
pnewnode-plink=null;
if(position == 0)
{
if(plist-elementcount == 0)
{
plist-pheaderpointer=pnewnode;
pnewnode-plink=plist-pheaderpointer;
}
else{
plastnode=plist-pheaderpointer;
pprenode=plist-pheaderpointer;
while(plastnode-plink != plist-pheaderpointer)
{
plastnode=plastnode-plink;
}

plastnode-plink=pnewnode;
pnewnode-plink=pprenode;
plist-pheaderpointer=null;
plist-pheaderpointer=pnewnode;
}
}
else{
pprenode=plist-pheaderpointer;
for(i=0 ; i position - 1 ; i++)
{
pprenode=pprenode-plink;
}
pnewnode-plink=pprenode-plink;
pprenode-plink=pnewnode;
}
}
else{
puts(인덱스 오류);
printf(position: [%d], elementcount: [%d]\n,
position, plist-elementcount);
}
ret=true;
plist-elementcount++;
}
return ret;
}

int removeelement(circlelistnode* plist,int position){//원소삭제
int i;
int ret=false;
circlelinkedlist* pprenode=null, *pdelnode=null, *plastnode=null;
if(plist != null)
{
if(position = 0 &&
position plist-elementcount)
{
if(position == 0)
{
pdelnode=plist-pheaderpointer;
if(plist-elementcount == 1)
{
plist-pheaderpointer=null;
free(pdelnode);
}
else{
plastnode=plist-pheaderpointer;
while(plastnode-plink != plist-pheaderpointer)
{
plastnode=plastnode-plink;
}
p;plastnode-plink=pdelnode-plink;
plist-pheaderpointer=pdelnode-plink;
pprenode-plink=null;
free(pprenode);
}
}
else
{
pprenode=plist-pheaderpointer;

for(i=0; iposition-1; i++)
{
pprenode=pprenode-plink;
}
pdelnode=pprenode-plink;
pprenode-plink=pdelnode-plink;
pdelnode-plink=null;
free(pdelnode);
}
}
else{
puts(인덱스 오류);
printf(position: [%d], elementcount: [%d]\n,
position, plist-elementcount);
}
ret=true;
plist-elementcount--;

}
return ret;

}
void displaycirclelist(circlelistnode* plist) //전체요소출력
{
int len,i;
len=getlengt(plist);
printf(현재 원소 개수: [%d]\n,plist-elementcount);
for(i=0 ; ilen ; i++){
printf([%d]: %d\n,i,getelement(plist,i)-data);
}
}
int getlengt(circlelistnode* plist) //전체길이반환
{
int len=0;
if(plist != null)
len=plist-elementcount;
return len;
}
circlelinkedlist* getelement(circlelistnode* plist,int position) //현재원소리턴
{
int i;
circlelinkedlist* preturn=null, *pprenode=null;
if(plist != null)
{
if(position = 0 &&
position plist-elementcount){
pprenode=plist-pheaderpointer;
for(i=0; iposition; i++){
pprenode=pprenode-plink;
}
preturn=pprenode;
}
else{
puts(출력 오류);
}
}
return preturn;
}
void deleteheapmemory(circlelistnode* plist) //메모리해제
{
int len,i;
len=getlengt(plist);
for(i=0; ilen; i++)
{
removeelement(plist,i);
}
puts(프로그램이 정상 종료돼었습니다);
}

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