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Off-Topic forum home | recent threads | search | my Ordeals ť profile | log out Infrequently Asked Questions in comp.lang.c jump to last read break Infrequently Asked Questions in comp.lang.c Posted on 2003-04-27 23:18 View Profile Just a bit of fun this - the comp.lang.c IAQ (Infrequently Asked Questions). Andrei Ellman Member# 3,434 http://www.plethora.net/~seebs/faqs/c-iaq.html April 2003 ;D Andrei Ellman AE. -- Don't let the illegitimates turn you into carbon. Posted on 2003-04-28 00:07 View Profile Some of those are pretty funny. Now, anyway. When I was first learning C though, that page would have Derezo been helpful! ;D Member# 1,666 _______________________________________________________ April 2001 Derezo the Kamikaze - [STIFFU*] Announcer: "We start with authentic letter graded meat, Derezo and process the hell outta it. 'Til it's good enough for Krusty." Krusty: "Try my new Krusty Ribwich. MmmMMmmM! I don't mind the taste!" Posted on 2003-04-28 11:02 View Profile LOL! Quote: ----------------------------------------------------- Evert Member# 794 10.7: Can I declare main as void, to shut off these November 2000 annoying ``main returns no value'' messages? (I'm calling exit(), so main doesn't return.) Evert Certainly. You can also declare it as double. It may not compile, or it may crash, but who cares? No lousy bunch of whining lusers is going to tell *you* what to do. ----------------------------------------------------- Posted on 2003-04-28 13:02 View Profile Quote: ----------------------------------------------------- 2.3: How does struct passing and returning work? The structures are put into the low part of the VGA card's VRAM. They are then removed before the next video update. This is why struct passing was not supported for a long time; VGA cards were prohibitively CGamesPlay expensive. Member# 2,559 July 2002 If you try to pass very large structures on the stack, you may see odd screen graphics. CGamesPlay ----------------------------------------------------- So that's why my app wasn't working properly! :P -- Speedhack '03: http://www14.brinkster.com/rpatters/speedhack/ Ryan Patterson - http://www14.brinkster.com/rpatters/temp/downloads.html allegro.cc | allegrodeveloper.org | Pixelate Posted on 2003-04-28 15:07 View Profile Ah, good. Just what I need to fend off the newbs. Andrei, I love you. ;D Bruce Perry Member# 270 -- April 2000 [ DUMB - a Freeware IT/XM/S3M/MOD player library, with filters and click removal ] Bruce Perry [ Set Up Us The Bomb !!! - a team effort | Sheep 2, featuring real piano music ] Bananas don't have skin ˇ They have shell <_phate_> what is the difference between .it and .mp3? Posted on 2003-04-28 15:11 View Profile Quote: ----------------------------------------------------- 1.6: I finally figured out the syntax for declaring pointers to functions, but now how do I initialize one? With the assignment operator. You were perhaps expecting a screwdriver? ----------------------------------------------------- Heh :) Quote: ----------------------------------------------------- 1.8: What's the auto keyword good for? Declaring vehicles. 23yrold3yrold Member# 1,134 ----------------------------------------------------- March 2001 Ha! In C++ we can build vehicle objects from scratch! C++ 23yrold3yrold IS T3H B357357!!11`1 Quote: ----------------------------------------------------- 2.10: Can I initialize unions? Depends. They may go on strike when provoked. Luckily, if your program involves air traffic control, the ISO standard guarantees that Ronald Reagan will fire any unions that go on strike, and replace them with structs, which should be close enough. ----------------------------------------------------- ;D -- Chris Barry - Optimus Rhyme; oh yes ... [ My Game | My Site | My Journal | Allegro FAQ | Pixelate | Vivace | AGDN | Foolish Faith ] Work for the best, prepare for the worst, expect nothing, and you will always be content. Posted on 2003-04-28 15:17 View Profile 23yrold3yrold said: ----------------------------------------------------- Ha! In C++ we can build vehicle objects from scratch! Bruce Perry ----------------------------------------------------- Member# 270 April 2000 Reinvent the wheel, why don't you. ;) Bruce Perry *runs* -- [ DUMB - a Freeware IT/XM/S3M/MOD player library, with filters and click removal ] [ Set Up Us The Bomb !!! - a team effort | Sheep 2, featuring real piano music ] Bananas don't have skin ˇ They have shell <_phate_> what is the difference between .it and .mp3? Posted on 2003-04-28 15:23 View Profile *runs down BP in his CTank: public CMilitaryVehicle: 23yrold3yrold public CVehicle: public CAuto* Member# 1,134 March 2001 -- Chris Barry - Optimus Rhyme; oh yes ... 23yrold3yrold [ My Game | My Site | My Journal | Allegro FAQ | Pixelate | Vivace | AGDN | Foolish Faith ] Work for the best, prepare for the worst, expect nothing, and you will always be content. Trumgottist Posted on 2003-04-28 17:19 View Profile Member# 95 A public military vehicle? What is the world coming to? April 2000 -- "I always prefer to believe the best of everybody - it Trumgottist saves so much time." - Rudyard Kipling Posted on 2003-04-28 18:32 View Profile My favourite so far: "5.9: How would I initialize an entire array from standard input? You have to use a loop. For instance, the following code reads the numbers zero through 99 into the array a. Bruce Perry for (i = 0; i < 100; ++i) Member# 270 a[i] = (scanf, ("%d", i)); April 2000 Make sure to include , or this may not work." Bruce Perry ;D -- [ DUMB - a Freeware IT/XM/S3M/MOD player library, with filters and click removal ] [ Set Up Us The Bomb !!! - a team effort | Sheep 2, featuring real piano music ] Bananas don't have skin ˇ They have shell <_phate_> what is the difference between .it and .mp3? Irrelevant Posted on 2003-04-28 19:08 View Profile Member# 2,382 Ummm... That's just nonsense. :-/ May 2002 /*--------------------*\ Irrelevant Allegus Irrelius: Beware! This strange beast is capable of deviating with astonishing speed and accuracy. Posted on 2003-04-28 19:27 View Profile No. That code works. Try it. ;) Bruce Perry -- Member# 270 [ DUMB - a Freeware IT/XM/S3M/MOD player library, with April 2000 filters and click removal ] [ Set Up Us The Bomb !!! - a team effort | Sheep 2, Bruce Perry featuring real piano music ] Bananas don't have skin ˇ They have shell <_phate_> what is the difference between .it and .mp3? Posted on 2003-04-28 19:30 View Profile Actually, no. IIRC, scanf returns the number of successfully assigned values, not the values themselves. 23yrold3yrold So it would be an array of a hundred one's. Member# 1,134 March 2001 -- Chris Barry - Optimus Rhyme; oh yes ... 23yrold3yrold [ My Game | My Site | My Journal | Allegro FAQ | Pixelate | Vivace | AGDN | Foolish Faith ] Work for the best, prepare for the worst, expect nothing, and you will always be content. Posted on 2003-04-28 20:05 View Profile Exactly. Nyah. :P It couldn't return the vals themselves, because then what would it return from: int foo; float bar; Irrelevant scanf("%i%f", &foo, &bar); Member# 2,382 Anyway, even if it did return the values, every loop it May 2002 would ask you for a number and reset i. Irrelevant ...and you'd also get a typecasting error (from int to int *). :P As I said, it's nonsense. S'got too many holes. It's still funny, though. ;D /*--------------------*\ Allegus Irrelius: Beware! This strange beast is capable of deviating with astonishing speed and accuracy. Posted on 2003-04-28 21:12 View Profile "and reset i." No, if you entered 99, it would stop the loop, if you CGamesPlay entered <99, it would keep going. Member# 2,559 July 2002 -- Speedhack '03: CGamesPlay http://www14.brinkster.com/rpatters/speedhack/ Ryan Patterson - http://www14.brinkster.com/rpatters/temp/downloads.html allegro.cc | allegrodeveloper.org | Pixelate Trumgottist Posted on 2003-04-28 21:15 View Profile Member# 95 Note the spare comma and then see the note on that FAQ April 2000 entry. -- Trumgottist "I always prefer to believe the best of everybody - it saves so much time." - Rudyard Kipling Posted on 2003-04-28 21:22 View Profile for (i = 0; i < 100; ++i) spellcaster a[i] = (scanf, ("%d", i)); Member# 1,493 is equal to September 2001 for (i = 0; i < 100; ++i) a[i] = i; spellcaster read the code, Luke. -- Always waiting for a new demo release of Chaos Funk Posted on 2003-04-28 21:23 View Profile Whoops. Missed the comma. :-X 23yrold3yrold That's messed up; someone want to explain to me what's Member# 1,134 going on there? March 2001 -- 23yrold3yrold Chris Barry - Optimus Rhyme; oh yes ... [ My Game | My Site | My Journal | Allegro FAQ | Pixelate | Vivace | AGDN | Foolish Faith ] Work for the best, prepare for the worst, expect nothing, and you will always be content. Posted on 2003-04-28 21:26 View Profile spellcaster What's the problem? Member# 1,493 scanf is called, the return value is discarded. "%d" is September 2001 just a string and would return itself, if there woudln't be yet another comma which makes sure that i is returned. spellcaster -- Always waiting for a new demo release of Chaos Funk Posted on 2003-04-28 23:36 View Profile Quote: ----------------------------------------------------- ...and you'd also get a typecasting error (from int to int *). :P ----------------------------------------------------- No you wouldn't. It's one of the optional arguments, so a plain ANSI C compiler will just take its type at face value (after doing some promotions like char,short->int and float->double). GCC will warn if you want, because it knows how scanf and similar functions are supposed to work. However, it won't do any conversions; it would be violating the ANSI C standard if it did. Don't worry guys, I didn't get it straight away either. I Bruce Perry had to read the note too. ;) Member# 270 April 2000 OK, here's the deal. scanf is NOT called; all that happens is the code takes a pointer to scanf. When you Bruce Perry get a comma, the left-hand expression is evaluated first and discarded (useful if it has a side-effect), and then the right-hand expression is evaluated. The whole expression has the value of the right-hand subexpression. Likewise, the "%d" (actually a pointer to such a string stored in read-only memory) is discarded, and the i is returned. So, give or take a couple of 'left-hand blah of comma has no effect' warnings (not an accurate quote ;) ), it compiles and does exactly what it says on the tin. :) PWNED. ;D -- [ DUMB - a Freeware IT/XM/S3M/MOD player library, with filters and click removal ] [ Set Up Us The Bomb !!! - a team effort | Sheep 2, featuring real piano music ] Bananas don't have skin ˇ They have shell <_phate_> what is the difference between .it and .mp3? Posted on 2003-04-29 00:08 View Profile Glad everyone seems to be enjoying the C IAQ. ;D After a bit of Googling around, I have found some IAQs for some other languages. * C++ * Perl Andrei Ellman Member# 3,434 The following are also IAQs, but these are more serious April 2003 than the above two. Andrei Ellman * Java * Java (again) * Python * Objective C Enjoy. -- Don't let the illegitimates turn you into carbon. Posted on 2003-04-29 00:19 View Profile Bah. the perl one is somewhat lame... but I like th atoi subroutine ;) # Q: How do I convert a string to a number? # A: Use this atoi function: sub atoi { my $t; foreach my $d (split(//, shift())) { $t = $t * 10 + $d; } } $number = atoi("123"); Or: # Q: How do I get the length of a variable? # A: Use length('$variable'); # to find out how long a variable is. Quote: ----------------------------------------------------- Q: Can I get a YACC grammar for the Perl language? A: Sorry, but as you must surely be aware by now, the only animals supported by Perl are ruminants such as camels and llamas. However, Yacc support may be forthcoming with version 5.007. Q: What are all those $@%* signs for? A: Watch your $@*$!% mouth, buddy! ----------------------------------------------------- Ok Ok.. The ones near the end are pretty good... But the first few are totally lame. Quote: ----------------------------------------------------- Q: How do I block warnings? A: The simplest way is to do: close STDERR; ----------------------------------------------------- Thomas Fjellstrom Quote: Member# 476 June 2000 ----------------------------------------------------- Thomas Q: How can I find out whether a number is odd? Fjellstrom A: sub odd { my $number = shift; return !even ($number); } Q: How can I find out whether a number is even? A: sub even { my $number = abs shift; return 1 if $number == 0; return odd ($number - 1); } ----------------------------------------------------- Those are good ;D :o Quote: ----------------------------------------------------- Q: Perldoc isn't running properly. Where can I find the documentation? A: perldoc perldoc ----------------------------------------------------- Ok.. the next one is just bad. Funny. But just wrong. Quote: ----------------------------------------------------- Q: What's the difference between single quoted strings and double quoted strings? A: Single quoted strings act like q(); double quoted strings act like qq(). ----------------------------------------------------- -- Thomas Fjellstrom - [Email] - [Website] - [Webpage] - Fav web comics: Penny Arcade - Megatokyo - PvP - Life Of Riley - Reallife - Gene Catlow Coke is the bane of humanity!!! So just why do I drink the stuff? Posted on 2003-04-29 00:28 View Profile Quote: ----------------------------------------------------- 23yrold3yrold scanf is NOT called Member# 1,134 March 2001 ----------------------------------------------------- 23yrold3yrold That's what I thought; Spellcaster confused me :P -- Chris Barry - Optimus Rhyme; oh yes ... [ My Game | My Site | My Journal | Allegro FAQ | Pixelate | Vivace | AGDN | Foolish Faith ] Work for the best, prepare for the worst, expect nothing, and you will always be content. 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