Hello Silvia,
Use FM:
CALL FUNCTION 'CHAR_FLTP_CONVERSION' "Format conversion: Character --> Floating point
EXPORTING
string = <pass your char value here> "CHAR input field for conversion to FLTP
IMPORTING
decim = "Number of decimal places determined
expon = "Gross power of 10 determined
flstr = "FLTP output field, from CHAR conversion
ivalu = "Value in STRING flag
.
BR,
Hitesh