/in/foo.cc: In function 'int main()':
/in/foo.cc:16:6: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   m=l+r>>1
     ~^~
/in/foo.cc:17:3: error: expected ';' before 'if'
   if (check(m))
   ^~
/in/foo.cc:19:3: error: 'else' without a previous 'if'
   else l=m+1;
   ^~~~
/in/foo.cc:21:5: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  m=l+r>>1;
    ~^~
/in/foo.cc: In function 'bool check(int)':
/in/foo.cc:44:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^