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scanHexDouble(_:)

Scans for a double value from a hexadecimal representation, returning a found value by reference.

Declaration

func scanHexDouble(_ result: UnsafeMutablePointer<Double>?) -> Bool

Parameters

  • result:

    Upon return, contains the scanned value. Contains HUGE_VAL or –HUGE_VAL on overflow, or 0.0 on underflow.

Return Value

true if the receiver finds a valid double-point representation, otherwise false. Overflow or underflow are both considered valid floating-point representations.

Discussion

This corresponds to %a or %A formatting. The hexadecimal double representation must be preceded by 0x or 0X.

Skips past excess digits in the case of overflow, so the scanner’s position is past the entire floating-point representation.

Invoke this method with NULL as result to simply scan past a hexadecimal double representation.

See Also

Scanning Numeric Values