valueIsNegative

Short summary

This assertion method checks if the current value is negative

Attention: Any comparsion to NaN is FALSE that means if currentValue is NaN then is the assertion false. For details check IEEE 754_.

Attention: currentValue has the value infinity means the assertion is false. currentValue has the value -infinity means the assertion is true. currentValue has the +0.0 means the assertion is false. currentValue has the value -0.0 means the assertion is true. For details check IEEE 754.

Parameters

Name	Type	Comment	Kind
currentValue	REAL	current value to check	input
message	AssertMessage	message if the assertion is false	input

Code

Declaration

METHOD valueIsNegative
VAR_INPUT
	(* current value to check *)
	currentValue	:REAL;
	(* message if the assertion is false *)
	message			:AssertMessage;
END_VAR
VAR
	(* just to cast ``currentValue`` *)
	currentValueAsDWord	:POINTER TO DWORD;
END_VAR

Implementation

IF (THIS^.isValueNaN(currentValue)) THEN	
	THIS^.assertionWasWrong(message, THIS^.getDebugInfo('valueIsNegative'));
ELSE
	currentValueAsDWord := ADR(currentValue);
	IF ((currentValueAsDWord^ AND THIS^.MASK_FOR_SIGN_BIT) = THIS^.ZERO) THEN
		THIS^.assertionWasWrong(message, THIS^.getDebugInfo('valueIsNegative'));
	END_IF
END_IF