unreachable and dead code

why i am getting unreachable and dead code warning , i am not able to understant.

if anyone knows, please help me.

[Image Analyst]

I can't even read that thing. What is that diagram? Is it Stateflow or Simulink (which I don't have)? How did you run your check on it? You might have some condition that is always false, like

value = false
if value
    % Do something if value = true
    % This block will never get executed since value is not a variable,
    % it's a constant.
end

[VINAY]

Now you can check

Answer 1

[Fangjun Jiang]

Before the Simulink funciton Counter_Check1() is called, there is this operation "Cnt=Cnt+CntTime1". Then, inside the function, there is this comparison "Cnt>=CntTime1". Maybe due to the fact that the value of "Cnt=InitValue" is zero or positive, the comparison "Cnt>=CntTime1" is always true.

So the "{%Do Nothing}" transition is never reached. It might be okay in terms of the logic, but in terms of software, it is regarded as "unreachable" or "dead code". It is not a good practice to have unreachable or dead code.

Change the "InitValue" to be negative to see if the warning disappear.

[VINAY]

hi @Fangjun Jiang i changed the "InitValue" To -ve eventhough warning is not dissppeared.

[Fangjun Jiang]

You can attach your model here for others to try.