save.c

C语言成绩管理系统

#include "stdio.h"
struct student
{
   long num;
   char name[20];
   float score;
 }
main()
{
   FILE *fp=NULL;
   char filename[20];
   struct student stud;
   int count=1;
   printf("\nplease input filename:");
   gets(filename);
   if((fp=fopen(filename,"wb+")==NULL))
   printf("error");
   while (count<100)
    {
        printf("\nplease input num:");
        scanf("%ld",&stud.num);
        if(stud.num==0)
        break;
        printf("\nplease input name:");
        scanf("%s",stud.name);
        printf("\nplease input score:");
        scanf("%f",stud.score);
        if(fwrite(&stud,sizeof(stud),1,fp)!=1)
          {
             printf("error");
             getch();
             exit(1);
           }
           count++;
     }
     fclose(fp);
     if((fp=fopen(filename,"rb")==NULL))
     printf("adsfsdf");
     while(fread(&stud,sizeof(stud),1,fp)!=NULL)
     printf("%ld%s%f",stud.num,stud.name,stud.score);

     fclose(fp);

}