Difference between revisions of "379: Forgetting"

Explain xkcd: It's 'cause you're dumb.
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(Explanation)
(Transcript: Making transcript a bit more accurate.)
Line 21: Line 21:
 
  prev->next = toDelete->next;
 
  prev->next = toDelete->next;
 
  delete toDelete;
 
  delete toDelete;
 +
 
  //if only forgetting were  
 
  //if only forgetting were  
  //this easy for me
+
  //this easy for me.
  
 
:Cueball: <sniff>
 
:Cueball: <sniff>

Revision as of 14:18, 27 April 2014

Forgetting
Of course, the assert doesn’t work.
Title text: Of course, the assert doesn’t work.

Explanation

Cueball is writing a piece of code (probably in the programming language C++) which removes an item from a data structure called a Linked list (the first two lines of the text). Then, he writes a comment (which is delimited by the double slashes) relating the code to his personal life. Finally, he adds an assertion, which is normally a formal specification of a condition which should always be true (with which the programmer ensures that e.g. mass is not negative). But in this case, instead of asserting a software-related predicate, he asserts that “it’s going to be okay.”

An "assert" is a programming statement that allows you to insert sanity checks into your code. For example, if you were writing a program to calculate the speed of a neutrino, then at the end of the calculation you could say:

assert ( velocity_of_neutrino <= speed_of_light );

If the assertion fails, then the program will stop with an error. This would be much better than publishing an embarrassing paper, for example.

The title text explains that assertion in question fails: we cannot be sure that things are going to be ok.

Transcript

[Cueball sits at computer, coding.]
prev->next = toDelete->next;
delete toDelete;

//if only forgetting were 
//this easy for me.
Cueball: <sniff>
[Cueball lowers his head into his hands and cries.]
[Cueball types again.]
assert "It's going to be okay.";


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Discussion

The syntax for pointers in C++ is &pointer and *pointer. The arrow syntax is used e.g. in PHP. So this explain does need a review. And furthermore it should focus on the assert joke, understandable for non programmers.--Dgbrt (talk) 18:48, 31 July 2013 (UTC)

Actually this works in C++ too. (*pointer).property is the same as pointer->property -- 17:58, 31 july 2013 (Time in Florida)
Do you have a code snippet, maybe this could help me to explain this comic for non programmers.--Dgbrt (talk) 22:43, 31 July 2013 (UTC)
At the moment I don't have a computer, just my phone, but I'll try (so i appologize for any typos in advance, you may correct them)

pair<int, int>* pntr = make_pair(5, 8); cout << (*pntr).first << endl; cout << pntr->first << endl; // the same as above

The arrow operator -> is a valid way to access object members using smart ptrs in C++

-- 22:12, 31 July 2013 (Florida)

I removed PHP as a possible language since PHP variable names start with a $. Zetfr 09:24, 20 May 2015 (UTC)
IT IS A COMBINACION EN C++/ANOTHER LENGUAGE IN THE FOURTH PANEL ASSERT HAS NOT PARENTHESES. IN C++ THE ASSERT MUST HAVE THE PARENTHESES AND SO CANNOT BE A C++ PROGRAM. PLEASE ADVISE 108.162.210.219 (talk) (please sign your comments with ~~~~)
I think he meant it as c++. Higher level languages that forego the parens tend to also forego the semicolon. Probably just a typo on Randall's part since he had recently learned Python relative to this. -- Flewk (talk) (please sign your comments with ~~~~)

man this one made me cry...

if i could at least forget what happened to sally... i wish it was as easy as "del filename".

this one, sadly, is too relatable for me. An user who has no account yet (talk) 15:56, 5 September 2023 (UTC)