foo.cc: In function 'int main()':
foo.cc:25:33: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'int' [-Wformat=]
   25 |                         scanf("%d",op);
      |                                ~^  ~~
      |                                 |  |
      |                                 |  int
      |                                 int*
foo.cc:25:30: warning: 'op' may be used uninitialized [-Wmaybe-uninitialized]
   25 |                         scanf("%d",op);
      |                         ~~~~~^~~~~~~~~
foo.cc:24:29: note: 'op' was declared here
   24 |                         int op;
      |                             ^~
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