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

#define _ARRAY_LENGTH  100

typedef struct Slist
{
 char *pName;
 int Age;
 struct Slist *pNext;
} NODE;

int Count=0;

NODE *pHead=NULL;

int PrintMenu();
void AddNode();
void PrintNode();
void DeleteNode();
int SelectMenu();
void DeleteAllNode();
void SaveNode();
void LoadNode();

void main()
{
 while(1)
 {
  switch(SelectMenu())
  {
  case 1:
   AddNode();
   break;
  case 2:
   PrintNode();
   break;
  case 3:
   DeleteNode();
   break;
  case 4:
   DeleteAllNode();
   break;
  case 5:
   SaveNode();
   break;
  case 6:
   LoadNode();
   break;
  case 7:
   DeleteAllNode();
   return;
  }
 }
}

void PrintNode()
{
 if(pHead==NULL)
 {
  puts("노드가 없습니다");
  return;
 }
 NODE *pCurrentNode=pHead;
 while(1)
 {
  printf("이름 : %s\n", pCurrentNode->pName);
  printf("나이 : %d\n", pCurrentNode->Age);
  if((pCurrentNode->pNext)!=NULL) pCurrentNode=pCurrentNode->pNext;
  else break;
 }
}

void AddNode()
{
 NODE *pNewNode=(NODE*)malloc(sizeof(NODE));
 char NameInput[_ARRAY_LENGTH]={0};
 printf("이름 : ");
 scanf("%s", NameInput); getchar();
 int Length=strlen(NameInput)+1;                                     //

 pNewNode->pName=(char*)malloc(Length);                 // pNewNode->pName=(char*)malloc(strlen(NameInput)+1); 
 strcpy(pNewNode->pName, NameInput);
 printf("나이 : ");
 scanf("%d", &(pNewNode->Age)); getchar();
 pNewNode->pNext=NULL;

 if(pHead==NULL) pHead=pNewNode;
 else
 {
  NODE *pCurrentNode=pHead;

  while(pCurrentNode->pNext!=NULL)
   pCurrentNode=pCurrentNode->pNext;
  
  pCurrentNode->pNext=pNewNode;
 }
}

void DeleteNode()
{
 NODE *pCurrent=pHead;
 NODE *pPrevNode=NULL;
 printf("지우고 싶은 회원을 입력하세요. ");
 char NameInput[_ARRAY_LENGTH]={0};
 scanf("%s", NameInput); getchar();

 NODE **Prev_pNext=NULL;

 while(1)
 {
  if(!strcmp(NameInput, pCurrent->pName))
  {
   if(Prev_pNext==NULL)
   {
    pHead=pCurrent->pNext;
    free(pCurrent->pName);
    free(pCurrent);
    pCurrent=pHead;
   }
   else
   {
    *Prev_pNext=pCurrent->pNext;
    free(pCurrent->pName);
    free(pCurrent);
    pCurrent=*Prev_pNext;
   }
  }
  else
  {
   Prev_pNext=&pCurrent->pNext;
   pCurrent=pCurrent->pNext;
  }
  if(pCurrent==NULL) break;
 }
}

void LoadNode()
{
 DeleteAllNode();

 FILE *pFile=fopen(".\\node.dat", "rb");
 if(pFile==NULL)
 { 
  puts("파일 로드에 실패 하였습니다.");
  return;
 }
 
 char Temp[_ARRAY_LENGTH]={0};
 NODE *pCurrentNode;
 NODE **Prev_pNext=NULL;

 while(1)
 {
  pCurrentNode=(NODE*)malloc(sizeof(NODE));
  if(Prev_pNext!=NULL) *Prev_pNext=pCurrentNode;
  if(pHead==NULL) pHead=pCurrentNode;
  fread(Temp, sizeof(char), _ARRAY_LENGTH, pFile);
  int Length=strlen(Temp)+1;
  pCurrentNode->pName=(char*)malloc(Length);
  strcpy(pCurrentNode->pName, Temp);
  fread(&pCurrentNode->Age, sizeof(int), 1, pFile);
  fread(&pCurrentNode->pNext, sizeof(NODE*), 1, pFile);
  Prev_pNext=&pCurrentNode->pNext;

  if(pCurrentNode->pNext==NULL) break;
 }

 puts("로드 되었습니다.");
}

void DeleteAllNode()
{
 if(pHead==NULL) return;
 NODE *pCurrentNode=pHead;
 NODE *pTemp;
 while(1)
 {
  pTemp=pCurrentNode->pNext;
  free(pCurrentNode->pName);
  free(pCurrentNode);
  if((pTemp)!=NULL) pCurrentNode=pTemp;
  else break;
 }
 pHead=NULL;
}

void SaveNode()
{
 if(pHead==NULL) return;
 FILE *pFile=fopen(".\\node.dat", "wb");
 if(pFile==NULL)
 { 
  puts("파일 저장에 실패 하였습니다.");
  return;
 }

 char TempName[_ARRAY_LENGTH]={0};
 NODE *pCurrentNode=pHead;

 while(pCurrentNode!=NULL)
 {
  strcpy(TempName, pCurrentNode->pName);
  fwrite(TempName, sizeof(char), _ARRAY_LENGTH, pFile);
  fwrite(&pCurrentNode->Age, sizeof(int), 1, pFile);
  fwrite(&pCurrentNode->pNext, sizeof(NODE*), 1, pFile);
  pCurrentNode=pCurrentNode->pNext;
 }
 
 fclose(pFile);

 puts("저장 되었습니다.");
}

int SelectMenu()
{
 int Select;
 printf("======================\n");
 printf("<<싱글 링크드 리스트>>\n");
 printf("======================\n");
 printf("1. 노드 추가\n");
 printf("2. 노드 출력\n");
 printf("3. 노드 검색 삭제\n");
 printf("4. 노드 모두 삭제\n");
 printf("======================\n");
 printf("5. 노드 파일 저장\n");
 printf("6. 노드 파일 읽기\n");
 printf("======================\n");
 printf("7. 프로그램 종료\n");
 printf("======================\n");
 printf("-> ");
 scanf("%d", &Select); getchar();
 return Select;
}

실력이 모자라서 좀 난잡하네요;