foo.cc: In function 'int main()':
foo.cc:30:14: warning: format '%lf' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
   30 |  printf("%.2lf%",t/l);
      |          ~~~~^   ~~~
      |              |    |
      |              |    int
      |              double
      |          %.2d
foo.cc:30:15: warning: spurious trailing '%' in format [-Wformat=]
   30 |  printf("%.2lf%",t/l);
      |               ^

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