Tutorials

h1. Exceptions in Scol

*exceptions* are not yet explicitely supported.

However, you can use this method :

"*_testpakS*":http://www.scolring.org/files/doc_html/_testpakS.html is a Scol function. It loads a source string in the current environment without running and it returns nil if no error found or an explicit string message if an error occurs. But the program continue.

<pre>

let _testpakS <string_code> -> result in

if result == nil then	// no error

	_loadS <code>

else

	// to do something

// continue

</pre>

Something like that :

<pre>

proto divideX = fun [] I;;

fun main ()=

	_showconsole;

	srand time;

	let (((rand&255)*100)>>8)-50 -> x in	// randomized value (-50 +50)

	let strcatn "fun divideX () = 100 / " :: (itoa x) :: ";;" :: nil -> strCode in

	let _testpakS strCode -> res in

	if (nil == res) then	// it's ok

	(

		_loadS strCode;	// we load and run this part of code

		_fooId divideX;

	)		

	else	// divide by zero !

	(

		_fooS res;

		_fooId x;

		1;

	);

	0;;

</pre>

Depending on the context, you can also use the Scol functions "*_testpak*":http://www.scolring.org/files/doc_html/_testpak.html or "*_test_exist*":http://www.scolring.org/files/doc_html/_test_exist.html.

License : "CC-BY-SA-2.0":https://creativecommons.org/licenses/by-sa/2.0/

Tutorial by iri

Updated by /