/in/foo.cc: In function 'int main()':
/in/foo.cc:17:4: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
    else
    ^~~~
/in/foo.cc:18:42: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
     cout<<a<<op<<b<<"="<<a/b<<"..."<<a%b;break;
                                          ^~~~~