在指定文件中查找指定编号的学生

#include "stdafx.h"
#include <stdlib.h>
#include <stdio.h>
#define N 30
typedef struct date
{
    int year;
    int month;
    int day;
}DATE;
typedef struct student
{
    long studentID;
    char studentName[10];
    char studentsex;
    DATE birthday;
    int score[4];
    float aver;
}STUDENT;
int SearchNuminFile(char fileName[],long key);
int main()
{
    int n;
    long key;
    printf_s("Input the searching ID:");
    scanf_s("%d",&key,sizeof(key));
    n = SearchNuminFile("student.txt",key);
    if(n != -1)
        printf_s("Record number is %d.
",n);
    else
        printf_s("Not found.
");
    return 0;
}
int SearchNuminFile(char fileName[],long key)
{
    FILE *fp;
    STUDENT stu[N];
    int i,j;
    if(fopen_s(&fp,fileName,"r") == NULL)
    {
        printf_s("Failure to open %s!
",fileName);
        exit(0);
    }
    system("pause");
    for(i = 0;!feof(fp);i++)
    {
        fread(&stu[i],sizeof(STUDENT),1,fp);
        if(key == stu[i].studentID)
        {
            printf_s("%10ld%8s%3c%6d/%02d/%02d",stu[i].studentID,
                stu[i].studentName,stu[i].studentsex,stu[i].birthday .year,
                stu[i].birthday.month,stu[i].birthday.day);
            for(j = 0;j < 4;j++)
            {
                printf("%4d",stu[i].score[j]);
            }
            printf_s("%6.1f
",stu[i].aver);
            fclose(fp);
            return i+1;
        }
    }
    fclose(fp);
    system("pause");
    return -1 ;
}