sort.c

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#ifndef SORTBYVOTE
#define SORTBYVOTE

#include "stdio.h"
#include "shead.h"
#include "string.h"
void SortByVote()
{
 candidate *s,*t;
 int total=CANDIDATENUM;
 candidate temp;
 int recNumber=0;
 int i,j,k;
 char DataFile[10]="houshuan";
 FILE * fp=fopen(DataFile,"rb");
 clrscr();
 if(fp==NULL)
 {
  printf("Open file %s fail!",DataFile);
  perror("Open file fail");
  getch();
  return;
 }
 s=(candidate*)malloc(sizeof(candidate)*total);
 if(s==NULL)
 {
  printf("allot memory fail!\n");
  printf("press any key to continu...\n");
  getch();
  return;
 }
 while(fread(&temp,sizeof(candidate),1,fp)!=(int)NULL)
 {
     s[recNumber].Number=temp.Number;
     strcpy(s[recNumber].Name,temp.Name);
     strcpy(s[recNumber].intro,temp.intro);
     s[recNumber].votenum=temp.votenum;
     recNumber++;
     if(recNumber>=total)
     {
      total+=INCREASE;
      t=realloc(s,total*sizeof(candidate));
      if(t==NULL)
      {
       printf("allot memory fail!\n");
       printf("press any key to continu..\n");
       free(s);/*释放内存*/
       getch();
       return;
      }
      s=t;
      t=NULL;
     }
 }
 fclose(fp);
 fp=NULL;
 /* 排序 */
 for (i=0;i<recNumber-1;i++)
 {
  k=i;
  for(j=i+1;j<recNumber;j++)
  {
    if(s[k].votenum<s[j].votenum) k=j;
  }
  if(k!=i)
  {
   temp.Number=s[i].Number;
   strcpy(temp.Name,s[i].Name);
   strcpy(temp.intro,s[i].intro);
   temp.votenum=s[i].votenum;

   s[i].Number=s[k].Number;
   strcpy(s[i].Name,s[k].Name);
   strcpy(s[i].intro,s[k].intro);
   s[i].votenum=s[k].votenum;

   s[k].Number=temp.Number;
   strcpy(s[k].Name,temp.Name);
   strcpy(s[k].intro,temp.intro);
   s[k].votenum=temp.votenum;
  }
 }

 fp=fopen(DataFile,"wb+");
 for(i=0;i<recNumber;i++)
 {
  if(fwrite(&s[i],sizeof(candidate),1,fp)!=1)
  {
   printf("\nWrite file %s fail!end with any key.\n",DataFile);
   perror("Write file fail!");
   free(s);/*释放内存*/
   getch();
   exit(1);
  }
 }
 fclose(fp);
 fp=fopen(DataFile,"rb");
 if(fp==NULL)
 {
  printf("\nOpen file %s fail!",DataFile);
  perror("Open file fail");
  free(s);/*释放内存*/
  exit(1);
 }
 printf("\nNumber\tName\tvote\n");
 while(fread(&temp,sizeof(candidate),1,fp)!=(int)NULL)
 {
  printf("%ld\t%s\t%d\n",temp.Number,temp.Name,temp.votenum);

 }
 fclose(fp);
 printf("Press any key to continu...");
 free(s);/*释放内存*/
 getch();
}
#endif