lt710.c

来自「陈孟建等编著的C语言教程附带光盘」· C语言 代码 · 共 32 行

# include "stdio.h"
 # include "stdlib.h"
   void main()
 { 
   struct
  { char name[10];
    int num;
    int age;
    float score;
  } stu;
   FILE *fp;
   int rec_no;
   long offset;
  if ((fp=fopen("stu_scor.dat","rb"))==NULL)
    { printf("不能打开该文件\n");
      exit(0);
    }
printf("请输入所需要的记录号：\n");
 scanf("%d",&rec_no);
 offset=(rec_no-1)*sizeof(stu);
  if (fseek(fp,offset,0)!=0)
   { printf("不能移动到该位置\n");
    exit(0);}
 fread(&stu,sizeof(stu),1,fp);
 printf("name: %s \n ",stu.name);
 printf("num: %d\n",stu.num);
 printf("age:%d\n",stu.age);
 printf("score: %5.2f\n",stu.score);
 fclose(fp);
 }