Thanks Deepak and Rahul for the reply. Do you guys have any standard document or any standard book which defines this? I totally agree with these answers but I don't have any formal written text.
In my example 1, the object is on stack and this lead to a1[0].z to be un-initialized. But as the specified in example 2, Why every element of arr is initialized, it is also on the stack ? Any source to answer this question ? Thanks Sagar On Sun, Sep 28, 2014 at 2:26 PM, Rahul Vatsa <[email protected]> wrote: > > http://stackoverflow.com/questions/3127454/how-do-c-class-members-get-initialized-if-i-dont-do-it-explicitly > > On Sun, Sep 28, 2014 at 12:22 PM, Deepak Garg <[email protected]> > wrote: > >> Hi >> >> In example 1, member z will have a garbage value (i.e. 0 in your case ) >> >> Thanks >> Deepak >> On Sep 28, 2014 11:29 AM, "sagar sindwani" <[email protected]> >> wrote: >> >>> I am working on How compilers handle initialization list. I came across >>> a case where I am not sure what should be the compiler behaviour. >>> >>> *Example 1:-* >>> >>> #include <iostream> >>> >>> class A >>> { >>> public: >>> int x,y,z; >>> }; >>> >>> int main() >>> { >>> A a1[2] = >>> { >>> { 1,2 }, >>> { 3,4 } >>> }; >>> >>> std::cout << "a1[0].z is " << a1[0].z << std::endl; >>> >>> return 0; >>> } >>> >>> In above case a1[0].z is ? g++ shows it as 0 ( zero ). It is exactly 0 >>> or garbage value, I am not sure on that. >>> >>> I tried lot of books and some documents , no where I found what C++ says >>> for initialization of class objects. >>> >>> You can find handling of below case in almost every book. >>> >>> *Example 2:- * >>> >>> int arr[6] = {0}; >>> >>> In Example 2, compilers will auto-fill all members with 0. It is >>> mentioned in books. But when it comes to User-defined datatypes nothing is >>> mentioned. >>> >>> >>> Please share your thoughts on this. If you find any document related to >>> this, please share it as well. >>> >>> Thanks >>> Sagar >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Algorithm Geeks" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "Algorithm Geeks" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> > > -- > You received this message because you are subscribed to the Google Groups > "Algorithm Geeks" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected].
