void data_load()
{
 
 st *newST;
 
 mj *newMJ;
 
 pf *newPF;

 FILE *ST = fopen ("st.txt","r");

 FILE *MJ = fopen ("mj.txt","r");

 FILE *PF = fopen ("pf.txt","r");
 
 newST = (st*)malloc(sizeof(pst));
 
 newMJ = (mj*)malloc(sizeof(pst1));
 
 newPF = (pf*)malloc(sizeof(pst2));

  newST = head;
  newMJ = head1;
  newPF = head2;

 while(fgetc(ST)!=0)
 {
 
  fscanf(ST,"%s   %s   %s   %s   %s\\n",newST->name,newST->STN,newST->adress,newST->PN,newST->grade);
  insert(newST);
  newST = newST->next;
 }

 while(feof(MJ)!=0)
 {
 
  fscanf(MJ,"%s   %s\\n",newMJ->name,newMJ->PN);
  insert1(newMJ);
  newMJ = newMJ->next;
 }
 while(feof(PF)!=0)
 {
 
  fscanf(PF,"%s   %s   %s   %s\\n",newPF->name,newPF->adress,newPF->EN,newPF->PN);
  insert2(newPF);
  newPF = newPF->next;
 
 }
 system("pause");
 system("cls");

}

void data_save()
{
 st *newST;
 
 mj *newMJ;
 
 pf *newPF;
 
 FILE *ST;

 FILE *MJ;

 FILE *PF;

 newST = (st*)malloc(sizeof(st));

 newMJ = (mj*)malloc(sizeof(mj));
  
 newPF = (pf*)malloc(sizeof(pf));

 ST = fopen ("st.txt","w");

 MJ = fopen ("mj.txt","w");

 PF = fopen ("pf.txt","w");
 
 newST = head;

 newMJ = head1;

 newPF = head2;

 while(newST!=tail)
 {  
   fprintf(ST,"%s   %s   %s   %s   %s\\n",newST->name,newST->STN,newST->adress,newST->PN,newST->grade);

   newST = newST->next;
  }
 if(newST==tail)
 {
 fprintf(ST,"%s   %s   %s   %s   %s\\n",newST->name,newST->STN,newST->adress,newST->PN,newST->grade);
 newST = NULL;
 }
 while(newMJ!=tail1)
  {
   fprintf(MJ,"%s   %s\\n",newMJ->name,newMJ->PN);
  
   newMJ = newMJ->next;
  }
 if(newMJ==tail1)
 {
  fprintf(MJ,"%s   %s\\n",newMJ->name,newMJ->PN);
  newMJ = NULL; 
 }
 while(newPF!=tail2)
  {  
  fprintf(PF,"%s   %s   %s   %s\\n",newPF->name,newPF->adress,newPF->EN,newPF->PN);

  newPF = newPF->next;
  }
 if(newPF==tail2)
 {
  fprintf(PF,"%s   %s   %s   %s\\n",newPF->name,newPF->adress,newPF->EN,newPF->PN);
  newPF = NULL;
 }

  fclose(ST);
  fclose(MJ);
  fclose(PF);

 system("pause");
 system("cls");

}

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