updaterecord.c

比较原始的学校出题系统

void updateRecord(FILE * fPtr)
{
 char y_n;
 int acctNum;
 struct examination ex2;
 printf("显示所有试题:");
 printf("any key to show ..");
 getch();
 rewind(fPtr);
 while(!feof(fPtr))
 {
  fread(&ex2,sizeof(struct examination),1,fPtr);
  if(ex2.acctNum == 0)
   printf("%d%-3s%-3s%-3d%-3d \n",ex1.acctNum,ex1.content,ex1.answer,ex1.type,ex1.knowledge);
 }
loop1:
 printf("Enter 编号 to update(1~100): ?");
 scanf("%d",&acctNum);
 while(acctNum<1||acctNum>100)
 {
  printf("输入有误请重输: ?");
  scanf("%d",&acctNum);
 }
 fseek(fPtr,(acctNum - 1)*sizeof(struct examination),SEEK_SET);
 fread(&ex2,sizeof(struct examination),1,fPtr);
 if(ex2.acctNum == 0)
 {
  printf("编号 %d has no information.\n",acctNum);
 }
 else
 {
  printf("%d%-3s%-3s%-3d%-3d \n",ex1.acctNum,ex1.content,ex1.answer,ex1.type,ex1.knowledge);
  printf("Enter new 试题内容(<100 bytes):\n?");
  scanf("%s",ex2.content);
  printf("Enter new 答案(<10bytes):\n?");
  scanf("%s",ex2.answer);
  fseek(fPtr,(acctNum - 1)*sizeof(struct examination),SEEK_SET);
  fwrite(&ex2,sizeof(struct examination),1,fPtr);
  printf("update 成功!\n");
 }
  printf("是否愿意继续 to update ?");
  y_n = getch();
  printf("%c",y_n);
  if(y_n == 'y') goto loop1;
}