Ага, спасибо.
Я уже тоже кое-что нашёл по вашей наводке. =)
Помогла unix-консоль: grep -R IfThen *
25.12.31 ifthen
Synopsis: Return one of two values, depending on a boolean condition
Declaration: function ifthen(val: Boolean;const iftrue: Integer;
const iffalse: Integer) : Integer; Overload
function ifthen(val: Boolean;const iftrue: Int64;const iffalse: Int64)
: Int64; Overload
function ifthen(val: Boolean;const iftrue: double;const iffalse: double)
: double; Overload
Visibility: default
Description: ifthen returns iftrue if val is True, and iffalse if val is False.
This function can be used in expressions.
25.12.32 InRange
Synopsis: Check whether value is in range.
Declaration: function InRange(const AValue: Integer;const AMin: Integer;
const AMax: Integer) : Boolean; Overload
function InRange(const AValue: Int64;const AMin: Int64;
const AMax: Int64) : Boolean; Overload
Visibility: default
Description: InRange returns True if AValue is in the range AMin..AMax. It returns False if Value lies
outside the specified range.
See also: EnsureRange (507)
25.12.35 IsNan
Synopsis: Check whether value is Not a Number
Declaration: function IsNan(const d: Double) : Boolean;
Visibility: default
512
Overload
CHAPTER 25. REFERENCE FOR UNIT ’MATH’
Description: IsNan returns True if the double d contains Not A Number (a value which cannot be represented
correctly in double format).
See also: IsZero (513), IsInfinite (512)
25.12.36 IsZero
Synopsis: Check whether value is zero
Declaration: function IsZero(const A: Single;Epsilon: Single) : Boolean; Overload
function IsZero(const A: Single) : Boolean; Overload
function IsZero(const A: Extended;Epsilon: Extended) : Boolean
; Overload
function IsZero(const A: Extended) : Boolean; Overload
Visibility: default
Description: IsZero checks whether the float value A is zero, up to a precision of Epsilon. It returns True
if Abs(A) is less than Epsilon.
The default value for Epsilon depends on the type of the argument: it is 1E-4 for Single, 1E-12
for Double and 1E-16 for extended.
See also: IsNan (512), IsInfinite (512), SameValue (528)