Question

In my C++ program I am trying to initialize a 3*3*3 array of type double with all 0’s.
In the class header file, I declared a member

double list[3][3][3];

When I printed out the content of this array, I found that not all entries are 0 as I expected. e.g. list[1][1][1] has value 4.03158e-321

Hence I manually initialized this array to all 0’s in the constructor:

list = {{{0,0,0},{0,0,0},{0,0,0}},
      {{0,0,0},{0,0,0},{0,0,0}},
      {{0,0,0},{0,0,0},{0,0,0}}};

This makes my program work, however, I got the compiler warning:

warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x

My question is therefore

1. Why does list have non-zero entries after being initialized in the
   header?
2. Why do I get the above warning message, and how to get rid of it?

My compiler is g++ (Ubuntu/Linaro 4.5.2-8ubuntu4) 4.5.2, with gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4)

Answer 1

Am I missing something or can you not just do

class Class {
public:
    double array[3][3][3];

    Class() : array() { }
};