/in/foo.cc: In function 'int main()':
/in/foo.cc:11:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     while(cin>>a+1)
                ~^~
/in/foo.cc:14:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         cin>>b+1;
              ~^~