#include "stdlib.h"
#include "stdio.h"
#define SIZE 5
main()
{
  struct student_type
     {
       char name[10];
       int num;
       int age;
       float score;
     }stud[SIZE];
     FILE *fp;
     int i;
     if((fp=fopen("stulist","wb"))==NULL)
       {printf("can not open file.\n");exit(0);}
     for(i=0;i<SIZE;i++)
        {scanf("%s%d%d%f",stud[i].name,&stud[i].num,&stud[i].age,&stud[i].score);
         if(fwrite(&stud[i],sizeof(struct student_type),1,fp)!=1)
         {printf("file write error!\n");break;}
        }
     fclose(fp);


}

什么问题？