LENGTH OF QUAN field

hai
I want to find the lenght of the field which data type as quan type
My Requirement is as follow
For example : variable with value 1.500
X = 1.5000 i want to find the length of the X . (My Excepted Answer should be 6)
I tried using the STRLEN and Describe Field Option but still i am not getting the correct count
Any Function Moudle or Code this ?

dear friend,
DESCRIBE FIELD <field> [LENGTH <l>] [TYPE <t> [COMPONENTS <n>]]
                   [OUTPUT-LENGTH <o>] [DECIMALS <d>]
                   [EDIT MASK <m>] [HELP-ID <h>].
Attributes of SAP ABAP Data Objects can be determined at Runtime. The following attributes can be determined at runtime.
FIELD LENGTH
DATA TYPE
OUTPUT LENGTH
DECIMAL PLACES
CONVERSION ROUTINE
DISTANCE BETWEEN TWO FIELDS
HELP TEXT ID
Data: d_intiger    type i,
      d_float      type f,
      d_packed     type p,
      d_character type c,
      d_date       type d,
      d_numc       type n,
      d_time       type t,
      d_hexa       type x,
      d_type       type c.
      DESCRIBE FIELD d_intiger type d_type.
      Write:/ 'd_intiger', d_type.
      DESCRIBE FIELD d_float type d_type.
      Write:/ 'd_float', d_type.
      DESCRIBE FIELD d_packed type d_type.
      Write:/ 'd_packed', d_type.
      DESCRIBE FIELD d_character type d_type.
      Write:/ 'd_character', d_type.
      DESCRIBE FIELD d_date type d_type.
      Write:/ 'd_date', d_type.
      DESCRIBE FIELD d_numc type d_type.
      Write:/ 'd_numc', d_type.
      DESCRIBE FIELD d_time type d_type.
      Write:/ 'd_time', d_type.
      DESCRIBE FIELD d_hexa type d_type.
      Write:/ 'd_hexa', d_type.

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