/in/foo.cc: In function 'int main()':
/in/foo.cc:14:20: warning: self-comparison always evaluates to false [-Wtautological-compare]
   14 |                 num!=num;
      |                 ~~~^~~~~
/in/foo.cc:14:20: warning: statement has no effect [-Wunused-value]
   14 |                 num!=num;
      |                 ~~~^~~~~