This question is not appropriate for this mailing list, questions about using GCC should be sent to the gcc-h...@gcc.gnu.org list, please take any follow up there, thanks.
On 24 February 2012 08:34, Yang Yueming wrote: > > The result of xyz should be "0"，but it is "2468acf123579bc" ,same as xyz = > abc << 1,Why? The C standard says it's undefined behaviour: "If the value of the right operand is negative or is greater than or equal to the width of the promoted left operand, the behavior is undefined."
