2.0 3.0 > lang > type > float
Zurück  Weiter  Bearbeiten  Umbenennen  Rückgängig  Suchen  Verwaltung
 Dokumentation
Achtung! Diese Seite wurde noch nicht übersetzt.  Siehe englische Version
Float
DIM Var AS Float

This native datatype represents a double floating point value, i.e. a eight bytes floating point value.

The value of a Float is a number between -8.98846567431105E+307 and +8.98846567431105E+307

The precision of Float is 52 binary digits, which is 16 decimal digits (2^-52). This means: if add to 1.0 a (positive) number which is less than 2E-16 than the result will be exactly 1.0

### Beispiel

DIM x AS Float = Sin(0.32)
DIM y AS Float = x - (0.32 - 0.32 ^ 3 / (2 * 3))

PRINT x;;y

0.314566560616 2.789394945107E-5

 Overflow during Float arithmetic operations is not detected! Instead the result is set to 1E+2147483647 resp -1E+2147483647 If such an overflowed number is used in further expressions, then the execution stops and a message window shows "Mathematic error". But the value of a Float can be compared against maxfloat or minfloat.

CONST maxfloat AS Float = +8.98846567431105E+307
CONST minfloat AS Float = -8.98846567431105E+307
...
IF y > maxfloat OR y < minfloat THEN
PRINT "Float y overflow"
ELSE
x = y / 23000
ENDIF

### Siehe auch

Datentypen, Single, Arithmetische Funktionen, Trigonometric Functions, Logarithms & Exponentials Functions