Needed some detailed explanation for following points -- In UNICODE

Question

Hi all
The following rules apply for converting a structure into a single field and vice versa:
1. If a structure is purely character-type, it is treated like a C field during conversion.
2. If the single field is of type C, but only part of the structure is character-type, conversion is only possible if the structure begins with a character-type structure and if this structure is at least as long as the single field. Conversion now takes place between the first character-type group of the structure and the single field. If the structure is the target field, the character type sections of the remainder are filled with blanks, and all other components are filled with the type-adequate initial value.
3. Conversion is not permitted if the structure is not purely character-type and if the single field is not of type C.
hi anybody can provide an explanation with examples
Thanks in advance.

Answer 1

The data layout of structures is relevant to UP checks with regard to the reliability of assignments and comparisons, for example. This data layout is represented in the Unicode fragment view. The fragment view breaks down the structure into alignment gaps, in byte and character-type areas, and all other types such as P, I, F, strings, references or internal tables.
Juxtaposed character-type components of a structure except strings are internally combined into a group if no alignment gaps exist between these components. All possible alignment requirements for characters are considered. Juxtaposed byte type components are grouped together in the same way.
Example
BEGIN OF struc,
  a(2) TYPE C,
  b(4) TYPE N,
  c    TYPE D,
  d    TYPE T,
  e    TYPE F,
  f(2) TYPE X,
  g(4) TYPE X,
  h(8) TYPE C,
  i(8) TYPE C,
END OF struc.
Fragment 1: a, b, c, d
Fragment 2: Alignment gap between d and e
Fragment 3: e
Fragment 4: f, g
Fragment 5: Alignment gap between g and h
Fragment 6: h, i