4.1.3.1.34 CompareValue

CompareValue function

Prototype:	function CompareValue (const A, B :Double; Epsilon :Double 0) :integer;
Description:	The CompareValue compares the numbers A and B in a tolerant way. If the numbers A and B close to each other are considered to be equal. The parameter Epsilon is the permissible tolerance.
Syntax:	CompareValue(A, B, Epsilon); / variable:= CompareValue(A, B, Epsilon);
	Part	Description
	variable	A variable declared as integer
	A	A parameter declared as double to compare
	B	A parameter declared as double to compare
	Epsilon	A parameter declared as double, this is a tolerance between numbers A and B
Return value:	0 ... if numbers A and B is equal ... A=B -1 ... if A is less than B ... A<B 1 ... if A is bigger than B ... A>B

Example:

var

a,b : double;

epsilon : double;

x : integer;

begin

a:= 2.15;

b:= 2.14;

epsilon:= 0.001;

x:= CompareValue(a,b, epsilon);

ShowMessage(IntToStr(x));

end.

// Next examples: CompareValue(2.1, 2.2, 0) = -1

// CompareValue(2.3, 2.1, 0.1) = 1

// CompareValue(2.1, 2.3, 0.2) = 0

Output in Field-Map Data Collector: