foo.cc: In function 'int main()':
foo.cc:9:15: warning: format '%lf' expects argument of type 'double', but argument 2 has type 'long double' [-Wformat=]
    9 |   printf("%.2lf",n*0.8);
      |           ~~~~^  ~~~~~
      |               |   |
      |               |   long double
      |               double
      |           %.2Lf
foo.cc:11:15: warning: format '%lf' expects argument of type 'double', but argument 2 has type 'long double' [-Wformat=]
   11 |   printf("%.2lf",n*0.85);
      |           ~~~~^  ~~~~~~
      |               |   |
      |               |   long double
      |               double
      |           %.2Lf
foo.cc:13:15: warning: format '%lf' expects argument of type 'double', but argument 2 has type 'long double' [-Wformat=]
   13 |   printf("%.2lf",n*0.9);
      |           ~~~~^  ~~~~~
      |               |   |
      |               |   long double
      |               double
      |           %.2Lf
foo.cc:15:15: warning: format '%lf' expects argument of type 'double', but argument 2 has type 'long double' [-Wformat=]
   15 |   printf("%.2lf",n*0.95);
      |           ~~~~^  ~~~~~~
      |               |   |
      |               |   long double
      |               double
      |           %.2Lf
foo.cc:17:15: warning: format '%lf' expects argument of type 'double', but argument 2 has type 'long double' [-Wformat=]
   17 |   printf("%.2lf",n);
      |           ~~~~^  ~
      |               |  |
      |               |  long double
      |               double
      |           %.2Lf

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