/in/foo.cc: In function 'int main()':
/in/foo.cc:12:17: warning: statement has no effect [-Wunused-value]
   12 |             num == 30;
      |             ~~~~^~~~~
/in/foo.cc:14:17: warning: statement has no effect [-Wunused-value]
   14 |             num == 31;
      |             ~~~~^~~~~
/in/foo.cc:9:13: warning: 'num' may be used uninitialized [-Wmaybe-uninitialized]
    9 |         num +=28+leap;
      |         ~~~~^~~~~~~~~
/in/foo.cc:7:5: note: 'num' was declared here
    7 | int num;
      |     ^~~