foo.cc: In function ‘double qian_zhui_biao_da_shi()’:
foo.cc:7:13: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[15]’ [-Wformat=]
    7 |     scanf("%s",&ch);
      |            ~^  ~~~
      |             |  |
      |             |  char (*)[15]
      |             char*

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