Loop optimization

[Jouko Koski]

"div0" <div0 at users.sourceforge.net> wrote:
>>> Jérôme M. Berger wrote:
>>>> That depends. In C/C++, the default value for any global variable
>>>> is to have all bits set to 0 whatever that means for the actual data
>>>> type.
> Ah, I only do C++, where the standard is to not initialise.

No, in C++ all *global or static* variables are zero-initialized. By 
default, stack variables are default-initialized, which means that doubles 
in stack can have any value (they are uninitialized).

The C-function calloc is required to fill the newly allocated memory with 
zero bit pattern; malloc is not required to initialize anything. Fresh heap 
areas given by malloc may have zero bit pattern, but one should really make 
no assumptions on this.

-- 
Jouko