foo.cc: In function 'bool check(double)':
foo.cc:20:9: warning: unused variable 'hh' [-Wunused-variable]
     int hh = 0, tt = 0; 
         ^~
foo.cc:20:17: warning: unused variable 'tt' [-Wunused-variable]
     int hh = 0, tt = 0; 
                 ^~
foo.cc: In function 'int main()':
foo.cc:49:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%s", str);
             ~~~~~^~~~~~~~~~~

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