stdout:

stderr:
/home/wangfiox/Documents/database/hidden_functional_c/sy/03_branch.sy:13:19: warning: use of logical '&&' with constant operand [-Wconstant-logical-operand]
        if (f % c && e) return 4;
                  ^  ~
/home/wangfiox/Documents/database/hidden_functional_c/sy/03_branch.sy:13:19: note: use '&' for a bitwise operation
        if (f % c && e) return 4;
                  ^~
                  &
/home/wangfiox/Documents/database/hidden_functional_c/sy/03_branch.sy:13:19: note: remove constant to silence this warning
        if (f % c && e) return 4;
                 ~^~~~
1 warning generated.