please wait
conditional operator
Aug 4, 2013 at 4:35pm
Why does this print 11 12:
If I parenthesize (++x, ++y), it is still 12 11, but if I parenthesize (--x, --y) but not the ++ ones it is 12 12!
The condition is true so why does the -- affect my ++ ones?
|
|
If I parenthesize (++x, ++y), it is still 12 11, but if I parenthesize (--x, --y) but not the ++ ones it is 12 12!
The condition is true so why does the -- affect my ++ ones?
Aug 4, 2013 at 4:41pm
It is due to the definition of the conditional operator and its priority.
The conditional operator is defined as
conditional-expression:
logical-or-expression
logical-or-expression ? expression : assignment-expression
The assignment operator has higher priority compared with the comma operator
So your expression is equivalent to
(( x > 10 && y > 10 ) ? ++x, ++y : --x ), --y;
The conditional operator is defined as
conditional-expression:
logical-or-expression
logical-or-expression ? expression : assignment-expression
The assignment operator has higher priority compared with the comma operator
So your expression is equivalent to
(( x > 10 && y > 10 ) ? ++x, ++y : --x ), --y;
Last edited on Aug 4, 2013 at 7:46pm
Aug 4, 2013 at 5:39pm| @Codeez Why does this print 11 12: int x = 11, y = 11; (x > 10 && y > 10) ? ++x, ++y : --x, --y; cout << x << " " << y; // 11 12 |
By the way your original post contains a typo. There should be 12 11 instead of 11 12 as you wrote.:)
Aug 4, 2013 at 7:37pm
@vlad thanks again. I find that a bit bizzare though considering I parenthesized the condition before the ?.
Aug 4, 2013 at 7:47pm
In my example there was a typo. The condition should be enclosed in parentheses.:)
Topic archived. No new replies allowed.