If I have the following expression:
c = (a) * (b)
What does the C90 standard say about the order evaluation of the subexpression ‘a’ and ‘b’?
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If I have the following expression:
c = (a) * (b)
What does the C90 standard say about the order evaluation of the subexpression ‘a’ and ‘b’?
There is no specified order since the multiplication operator is not a sequence point. Sequence points include the comma operator, the end of a full expression, and function calls. Thus the order of evaluation of
(a)and(b)is up to the compiler implementation. Therefore you shouldn’t attempt to-do something in(a)that would have a side-effect that you want to be seen in(b)in order to generate a valid result.For instance:
If you want a full-listing of sequence points for C, you can check out a more thorough reference here.