Computer Science Canada := and =? |
| Author: | Luffy123 [ Mon May 07, 2012 8:31 pm ] |
| Post subject: | := and =? |
What is the difference between the two? I tried and it works still. var num : int num = 3 num := 3 both work. the first one gets a warning though but still works. |
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| Author: | Amarylis [ Mon May 07, 2012 8:33 pm ] |
| Post subject: | RE::= and =? |
The first one, while it does work, is supposed to be only for boolean expressions (comparison). The second one is the actual syntax for value assignment. |
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| Author: | mirhagk [ Mon May 07, 2012 10:03 pm ] |
| Post subject: | RE::= and =? |
You should never use the first way, as within certain contexts it could be problematic (although those contexts might not be common in Turing) |
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| Author: | Raknarg [ Tue May 08, 2012 11:03 am ] |
| Post subject: | RE::= and =? |
Could you give us an example, mirhagk? |
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| Author: | Tony [ Tue May 08, 2012 12:22 pm ] | ||
| Post subject: | RE::= and =? | ||
in C and such one might accidentally write code such as*
instead the code _assigns_ 3 to the counter, and the result is evaluated to be true. * actual C code uses == for comparison and = for assignment. |
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| Author: | mirhagk [ Tue May 08, 2012 3:24 pm ] |
| Post subject: | RE::= and =? |
That is precisely what I was thinking of Tony. Although I'm trying to think of a way this could happen in Turing. Does turing set equal operator return the value? Is the following possible? [syntax="turing'] var num1:=42 var num2:int var num3:=num2:=num1 [/syntax] |
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| Author: | evildaddy911 [ Tue May 08, 2012 3:50 pm ] |
| Post subject: | RE::= and =? |
no, turing gives you a syntax error |
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| Author: | mirhagk [ Tue May 08, 2012 7:41 pm ] |
| Post subject: | RE::= and =? |
so then I can't think of a context where it'd be an issue |
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