/in/foo.cc: In function 'double qian_zhui_biao_da_shi()':
/in/foo.cc:10:13: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[15]' [-Wformat=]
   10 |     scanf("%s",&ch);
      |            ~^  ~~~
      |             |  |
      |             |  char (*)[15]
      |             char*