Question 26 Answer seems wrong on site quiz

Kleid-0 · 04-16-2005, 02:47 PM

Code:

What is the outcome of running the following code: int c=0; cout<<c++<<c;

Undefined
01
00

I tried out the program and I keep getting 01...

Code:

psycho@Shiva:~/Programming/Laboratory$ g++ -ansi -pedantic -Wall coutUndefined.cpp
psycho@Shiva:~/Programming/Laboratory$ ./a.out
01

Xipher · 04-16-2005, 03:01 PM

I believe what is ment by Undefined, is its not stated specificly in the standard what will come out, so it can vary from compiler to compiler, and/or platform to platform. Basicly, you will never know the exact outcome, so don't expect what you got to be the same as what some one else would.

**Salem** · 04-16-2005, 03:03 PM

> I tried out the program and I keep getting 01...
You misunderstand the nature of "undefined".
http://www.eskimo.com/~scs/C-faq/q11.33.html
This specifically includes all your expected answers, and a whole bunch of other outcomes as well.

And yes, that quiz question has the right answer.
http://www.eskimo.com/~scs/C-faq/s3.html
You'll always come unstuck if you try and do too much with the increment and decrement operators.

04-16-2005, 03:01 PM	#2
Xipher Registered User Join Date: Sep 2004 Posts: 197	I believe what is ment by Undefined, is its not stated specificly in the standard what will come out, so it can vary from compiler to compiler, and/or platform to platform. Basicly, you will never know the exact outcome, so don't expect what you got to be the same as what some one else would. __________________ If any part of my post is incorrect, please correct me. This post is not guarantied to be correct, and is not to be taken as a matter of fact, but of opinion or a guess, unless otherwise noted.
Xipher is offline

04-16-2005, 03:03 PM	#3
Salem and the hat of Jobseeking Join Date: Aug 2001 Location: The edge of the known universe Posts: 21,676	> I tried out the program and I keep getting 01... You misunderstand the nature of "undefined". http://www.eskimo.com/~scs/C-faq/q11.33.html This specifically includes all your expected answers, and a whole bunch of other outcomes as well. And yes, that quiz question has the right answer. http://www.eskimo.com/~scs/C-faq/s3.html You'll always come unstuck if you try and do too much with the increment and decrement operators. __________________ If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
Salem is offline

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