将字符串转为数字

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要求：将字符串转化为对应的数值，如‘123’转为 1.2300000000000000E+02， ‘123a’会转化为0.0000000000000000E+00。

当字符串为空，先赋给它为‘0’.

data:  ZUEGNRT_STR type c LENGTH 5 , res type c LENGTH 1.
DATA:  ZUEGNRT_F TYPE F,ZUEKFRT_F  TYPE F.
ZUEGNRT_STR = '123'.

CONDENSE ZUEGNRT_STR NO-GAPS.

if ZUEGNRT_STR  = ''.
  ZUEGNRT_STR = '0'.
ENDIF.

CALL FUNCTION 'CHAR_FLTP_CONVERSION' "Format conversion: Character --> Floating point
EXPORTING
*   dyfld = SPACE               "               Screen Field name for cursor positioning
*   maskn = SPACE               "               Masking character if input screen
*   maxdec = '16'               " t006-decan    Maximum number of input decimal places
*   maxexp = '59+'              " t006-expon    Maximum gross power of 10
*   minexp = '60-'              " t006-expon    Minimum gross power of 10
    string =   ZUEGNRT_STR                  "               CHAR input field for conversion to FLTP
*   msgtyp_decim = 'W'          " sref-msgtyp   Message type for 'TOO_MANY_DECIM' (see domains)
  IMPORTING
   " decim =   2                  "               Number of decimal places determined
    "   expon =  3                    "               Gross power of 10 determined
    flstr =   ZUEGNRT_F                  " FLTP output field, from CHAR conversion
   " ivalu =   'X'                  "               Value in STR;ING flag
  EXCEPTIONS
    EXPONENT_TOO_BIG = 1        "               Gross power of 10 is too big
    EXPONENT_TOO_SMALL = 2      "               Gross power of 10 is too small
    STRING_NOT_FLTP = 3         "               STRING cannot be interpreted as floating point
    TOO_MANY_DECIM = 4          "               Too many decimal places
    OTHERS = 5.

if ZUEGNRT_F > 0 .
  res = 'Y'.
else.
  res = 'N'.
  ENDIF.
write: / ZUEGNRT_F.