There are two "sizes". The number of characters in the string (i.e. the index of the NULL) and the size of the array (how many elements it can hold). Moving the NULL changes the first. The second is a constant.
So sizeof() would always return the size of the array not the number of characters.
I guess I will go Googling for string functions and see if I can learn something, it will be an interesting exersize I may find a function comparable to Len() which returns the index of the NULL, who knows.
I guess the next logical question would be about resizing arrays ... I will give Google another go I am beginning to recognise things a little now perhaps it will make more sense that it did over the weekend.
All the help is very much appreciated thanks.