/in/foo.cc: In function 'int main()':
/in/foo.cc:8:21: warning: format '%lf' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
    8 |         printf("%.5lf",5*(a-32)/9);
      |                 ~~~~^  ~~~~~~~~~~
      |                     |          |
      |                     double     int
      |                 %.5d