xingmimg.c

C语言成绩管理系统

#include <stdio.h>
struct student
  {
    long num;
    char name[20];
    float score;
  }stud;
main()
{
     FILE *fp;
     struct student stud;
     char filename[20];
     char next;
     int result;
     long NO;
     printf("please input filename:\n");
     gets(filename);

     do{
              result=0;
              fp=fopen(filename,"rb");
              if(fp==NULL)
                  {
                       printf("error\n");
                       getch();
                       exit(1);
                   }
                 printf("\nplease input number:");
                             scanf("%ld",&NO);
               while(feof(fp)!=1)
                   {
                      if(fread(&stud,sizeof(stud),1,fp)!=1)
                            break;


                           if(stud.num==NO)
                             {
                                   result=1;
                                   printf("%ld,%s,%f",stud.num,stud.name,stud.score);
                                   getch();
                              }

                     }
         fclose(fp);


         if(result==0)
         printf("not find\n");
         printf("go on?");
         next=getch();
        }while(next=='y'||next=='Y');
       getch();
}