foo.cc:14:23: warning: multi-character character constant [-Wmultichar]
   14 |                 cout<<'Yes'<<endl;
      |                       ^~~~~
foo.cc:16:23: warning: multi-character character constant [-Wmultichar]
   16 |                 cout<<'No'<<endl;
      |                       ^~~~
foo.cc: In function ‘int main()’:
foo.cc:9:22: error: ‘a’ was not declared in this scope
    9 |                 if(n%a!=0)
      |                      ^