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+--- Thread: Ternary operator and Sequence Points in C (/Thread-Ternary-operator-and-Sequence-Points-in-C)
Ternary operator and Sequence Points in C - rafaeliawuefitjpu - 07-27-2023
I've an expression of the form shown below :-
while (count)
{
...
...
index = ((count == 20)? 0 : index++);
...
...
}
Now Ternary operators are sequence points in C but I believe that the sequence point ends at the test part.
Is this understanding correct and as such will this statement lead to undefined behaviour ?
RE: Ternary operator and Sequence Points in C - infusoriantumpetab - 07-27-2023
Right. There's a sequence point after the evaluation of the condition, but the next sequence point is the semicolon terminating the statement. So whenever `count != 20`, you have the undefined behaviour
index = index++;
since `index` is modified twice without intervening sequence point.