inquire_num()
    {
       int i,j=0,flag,sum;
       long inquire_num[20];
       system("cls");
      printf("\n                输入要查询的车辆编号:");
      scanf("%ld",&inquire_num);
      for(i=0;i<sum;i++)
          if(inquire_num==cars[i].num)                  warning C4047: '==' : 'long [20]' differs in levels of indirection from 'long '
          {
             printf("\n                   **车辆信息**\n");
             printf("车辆编号     车辆名称     车辆类型     车辆颜色     车辆数量     车辆价格     车辆备注\n");
     printf("\n\t  %5ld      %5s       %5s        %5s     %ld       %5ld",cars[i].num,cars[i].name,cars[i].type,cars[i].colour,cars[i].count,cars[i].price,cars[i].beizhu);
          }
          else j++;
          if(j==sum)
          printf("\n               该汽车不存在!");
        getch();
}