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

#define  NUMB_RECS  30
#define  LNAME_SIZE  25
#define  FNAME_SIZE  25
#define  PNUM_SIZE   12
#define  MAX_REC_SIZE  (LNAME_SIZE+FNAME_SIZE+PNUM_SIZE)
#define  NO_FIND     (-999)
#define  BLANK   ' '
void  selection_sort(char array[][MAX_REC_SIZE+2],int size1);
 void     twapt(char array[][MAX_REC_SIZE+2],int current,int low);
 int  binary_search(char candidate[],char array[][MAX_REC_SIZE+2],int size);
main()
{
    char students[NUMB_RECS][MAX_REC_SIZE+2];
    char candidate[LNAME_SIZE+2];
    int cand_len;
    int index;
    int i;
    FILE *fp;
    fp=fopen("students.dat","r");
    for(i=0;i<NUMB_RECS;++i)
        fgets(students[i],MAX_REC_SIZE+2,fp);
    selection_sort(students,NUMB_RECS);
    printf("\n\nEnter a students name, or signal EOF to halt");
        while (fgets(candidate,LNAME_SIZE+2,stdin)!=NULL){
            cand_len=strlen(candidate)-1;
            for(i=cand_len;i<LNAME_SIZE;i++)
                candidate[i]=BLANK;
            candidate[LNAME_SIZE]='\0';
            index=binary_search(candidate,students,NUMB_RECS);
            if(index!=NO_FIND)
                printf("\nRecord:  %s",students[index]);
            else {
                candidate[cand_len]='\0';
                printf("\n\t%s  is  not  in our directory.",candidate);
            }
            printf("\n\nEnter a student's name,or signal EOF to halt:");
        }
        return EXIT_SUCCESS;
}
void selection_sort(char array[][MAX_REC_SIZE+2],int size1)
{
    int smallest_index;
    int i,j;
    for(i=0;i<size1-1;++i){
        smallest_index=i;
        for(j=i+1;j<size1;++j)
            if(strcmp(array[j],array[smallest_index])<0)
                smallest_index=j;
            if(i!=smallest_index)
                twapt(array,i,smallest_index);
    }
}
void twapt(char array[][MAX_REC_SIZE+2],int current,int low)
{
    char temp[MAX_REC_SIZE+2];
    strcpy(temp,array[current]);
    strcpy(array[current],array[low]);
    strcpy(array[low],temp);
}

   int binary_search(char candidate[],char array[][MAX_REC_SIZE+2] ,int size)
   {
       int first=0;
       int last=size-1;
       int mid;
       int flag;
       while (first<=last){
           mid=(first+last)/2;
           flag=strncmp(candidate,array[mid],LNAME_SIZE);
           if(flag==0)
               return mid;
           if(flag>0)
               first=mid+1;
           else
               last=mid-1;
       }
       return NO_FIND;
   }
出现了这个图像
各位高手帮帮忙啊啊

                  
                              

students.dat这个文件要放在你建的工程的文件夹里面才能读出来

还是不行啊，我的系统是win7的，VC++6.0，可以编译的，，他又出现程序无法运行

好了好了，谢谢提醒，