char [length] initialization and dealing with it
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I have defined char array :
char d[6];
Correct me if I'm wrong regarding following:

At this moment no memory allocated for variable `d`. Now I'm going to initialize it:
`d="aaaaa"`; 
After this type inicialization no need to free memory - it will be done automatically.

How to know was `char[]` initialized? I need pattern `if filled(d){..}`

How to fill char[] with one kind of characters?
