void search_data1()//income查询收入
{
    struct  fi_info *p1,*p2;
    int nian,yue,day;
    if(incomehead==NULL) printf("没有记录数据!!!\n");
    else
        {
          printf("请输入要查询收入的年份:");
          scanf("%d",&nian);
          printf("请输入要查询收入的月份:");
          scanf("%d",&yue);
          printf("请输入要查询收入日期期:");
          scanf("%d",&day);
          p1=p2=incomehead;
          printf("你要查询的信息为:\n");
          while(p1!=NULL)//当p1不为空时循环查找符合要求的数据并输出
         {
              if(nian==(p1->year)&&yue==(p1->month))
              {printf("\n");
               printf("%d年%d月%d日   %s   %.2f元\n",p1->year,p1->month,p1->day,p1->name,p1->money);
           }
         p1=p1->next;
          }
         }
 }