foo.cc: In function 'int main()':
foo.cc:9:17: warning: format '%f' expects a matching 'double' argument [-Wformat=]
  printf("%.2f,v");
                 ^
foo.cc:6:15: warning: variable 'v' set but not used [-Wunused-but-set-variable]
     float d,h,v;
               ^

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