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if expression [message #1758089]

Thu, 23 March 2017 12:29

Banafsheh Azizi

Messages: 328
Registered: July 2016

Senior Member

I have the below code, if I want to add one if condition before "if condition2" without else part what can I do?

if condition1
then
	exp1
else
       if condition2
       then
	        exp2
        else  
                exp3
      endif
endif;

if I do something like below, I have a syntax error("expected else").

if condition1
then
	exp1
else
       if extra condition
       then       if condition2
                        then
	                exp2
                        else  
                        exp3
                        endif
      endif
endif;

"extra condition" ensures that "condition2" is defined.

Member of MDSE Research Group
http://mdse.ui.ac.ir

[Updated on: Thu, 23 March 2017 12:36]

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Re: if expression [message #1758095 is a reply to message #1758089]

Thu, 23 March 2017 13:55

louis andia.

Messages: 47
Registered: November 2016

Member

No you can't. You have to define what happen if your extra condition isn't true. So it will probably be that in your case:

if condition1
then
	exp1
else
       if extra condition
       then       if condition2
                        then
	                exp2
                        else  
                        exp3
                        endif
      else  
       exp3
      endif
endif;

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Re: if expression [message #1758119 is a reply to message #1758095]

Thu, 23 March 2017 17:06

Banafsheh Azizi

Messages: 328
Registered: July 2016

Senior Member

Thanks for your kind help. My "exp3" has also many "if-then-else" expressions, is there any other idea?

Member of MDSE Research Group
http://mdse.ui.ac.ir

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Re: if expression [message #1758120 is a reply to message #1758119]

Thu, 23 March 2017 17:12

Banafsheh Azizi

Messages: 328
Registered: July 2016

Senior Member

In imperative part, I do something like this:

helper def : a : Boolean= false;
thisModule.a <- cond 1;	
if (cond 2)
{
	thisModule.a <-  thisModule.a + cond 3;
}

if ( thisModule.a){
....
}

Is it true?

Member of MDSE Research Group
http://mdse.ui.ac.ir

[Updated on: Thu, 23 March 2017 19:46]

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Re: if expression [message #1758128 is a reply to message #1758120]

Thu, 23 March 2017 18:33

louis andia.

Messages: 47
Registered: November 2016

Member

Your 'exp3' can be an helper to avoid code duplication.

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Re: if expression [message #1758142 is a reply to message #1758128]

Thu, 23 March 2017 19:44

Banafsheh Azizi

Messages: 328
Registered: July 2016

Senior Member

Thank you

Member of MDSE Research Group
http://mdse.ui.ac.ir

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