foo.cc: In function 'int main()':
foo.cc:7:17: warning: format '%f' expects argument of type 'float*', but argument 2 has type 'double*' [-Wformat=]
    7 |         scanf("%f,%f,%s",&a,&b,&op);
      |                ~^        ~~
      |                 |        |
      |                 float*   double*
      |                %lf
foo.cc:7:20: warning: format '%f' expects argument of type 'float*', but argument 3 has type 'double*' [-Wformat=]
    7 |         scanf("%f,%f,%s",&a,&b,&op);
      |                   ~^        ~~
      |                    |        |
      |                    float*   double*
      |                   %lf
foo.cc:14:15: warning: 'ans' may be used uninitialized [-Wmaybe-uninitialized]
   14 |         printf("%.2f",ans);
      |         ~~~~~~^~~~~~~~~~~~
foo.cc:5:16: note: 'ans' was declared here
    5 |     double a,b,ans;
      |                ^~~

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