Judge weather a character-string can be convert to type QUAN

Question

HI all.
Is there any Function that can judge weather a character-string can be convert to type QUAN?
IF no, could someone give me an efficient arithmetic.
Let me show my example:
FUNCTION z_judge_quan.
""Local interface:
*"  IMPORTING
*"     REFERENCE(STRING_IN) TYPE  CHAR12
*"  EXPORTING
*"     REFERENCE(QUAN) TYPE  BSEG-BPMNG
*"     REFERENCE(MESSAGE) TYPE  CHAR120
  DATA: len TYPE i,
       temp_str(20) TYPE c VALUE '00000000000000000000'.
  DATA pos TYPE i.
  DATA: a TYPE i.
  DATA string(20) TYPE c.
  DATA: off TYPE i.
  DATA: string_temp(20) TYPE c.
  string = string_in.
  CONDENSE string NO-GAPS.
  len = STRLEN( string ).
  temp_str(len) = string.
  a = len - 1.
  string_temp = string.
  CONDENSE string_temp.
  FIND '.' IN string  MATCH OFFSET off MATCH LENGTH pos.
  REPLACE SECTION OFFSET off LENGTH pos OF:
                string_temp WITH '|'.
  IF sy-subrc <> 0.
    IF  temp_str CO '0123456789'.
      message = 'Number'.
      quan = string.
    ELSE.
      message = 'not number'.
    ENDIF.
  ENDIF.
  IF sy-subrc = 0.
    pos = sy-fdpos + 2.
    FIND '.' IN string_temp." starting at pos
    IF sy-subrc =  0.
      message = 'not number'.
    ELSE.
      IF temp_str CO '0123456789.' AND temp_str0(1) <> '.' AND temp_stra(1) <> '.' .
        message = 'number'.
        quan = string.
      ELSE.
        message = 'not number'.
      ENDIF.
    ENDIF.
  ENDIF.
ENDFUNCTION.

Answer 1

Hi,
You can trap the exception as follows:
  DATA: oref TYPE REF TO  cx_sy_conversion_no_number.
  DATA: oflow TYPE REF TO cx_sy_conversion_overflow.
  data: c_menge type mseg-menge,
          p_inp(16) type c value 'ABCDEFGH'.
  TRY.
      CLEAR oref.
      c_menge = p_inp.
    CATCH cx_sy_conversion_no_number INTO oref.
      IF NOT oref IS INITIAL.    "if error
           message 'Not valid quantity'.
        exit.
      ENDIF.
    CATCH cx_sy_conversion_overflow INTO oflow.
      IF NOT oflow IS INITIAL.  "if overflow.
        CLEAR: p_inp.
        message 'not valid quantity'
        EXIT.
      ENDIF.
  ENDTRY.
Please award points if helpful..
regards,
S. Chandra Mouli.