Comments by John R. Shaw

John R. Shaw 16-May-20 12:26pm View

Technically, that would be number 3. It is what 'toni_1' thought he/she was doing. Coping by value means a copy is passed on the stack, which is what number 3 is doing. What 'toni_1' was doing amounted to passing a pointer to the original array, which means any change to the array in the function would change the original. Number 3 would only change the copy. That is why we need to specify constant variables in our arguments (I tell you where the data is, but you are not allowed to change it).

:) Rubiks - best time 2.54 minutes (now, have no idea).

John R. Shaw 28-Mar-20 1:42am View

Interesting. But do not post home work questions here. Grab a pencil and paper and figure it out.
-OR-
I could put on a blind fold and see if I could do it.

John R. Shaw 13-Mar-20 13:17pm View

LMAO! Thanks that's the best laugh I had in weeks.

I am still trying to stop and failing!

John R. Shaw 13-Mar-20 10:42am View

You are correct :)
But if I did not introduce such mistakes, how would they learn?

John R. Shaw 11-Mar-20 12:23pm View

And ending brace '}'. Also the weird '"' in the for loop will stop it from compiling.

Good catch on the 'free(p)'; otherwise BOOM!

John R. Shaw 27-Feb-20 5:12am View

If this was not an academic (home work) question, I would tell the person asking the question to reword it or jump off the nearest bridge. Researching other peoples solutions is not the same as finding your own. You need to break down the question piece by piece and figure it out from there. Other peoples solutions are not the only solution; who knows your untainted solution may be better.

John R. Shaw 9-Jan-20 23:25pm View

I actually like your solution better than mine. But there is one problem - do not hard code the number of characters in the extension.
A better solution:
return (strcmp(&szFileName[strlen(szFileName) - strlen(szExt), szExt);

John R. Shaw 8-Nov-18 13:26pm View

Try "while (x < 9 && getline(ss, token, ','))" to start with.

John R. Shaw 30-May-18 15:11pm View

Do not forget to remove the hard code "saleAmount = 100" and "taxRage = 10". Those are supplied as the parameters to the function.

John R. Shaw 28-May-18 17:41pm View

Sounds like it is time to break out the paper and pencil. Draw the 2 dimensional array [10x10 grid] with appropriate values, so you can visualize the problem.

John R. Shaw 25-May-18 14:28pm View

Returning a 'const' breaks normal behavior.
a = b = c; // 'const' or no 'const' this works
(a = b) = c; // is legal, but will not work if assignment operator returns 'const'
Which is why the default assignment operator is specified by the standard to return 'T&' instead of 'const T&'.

John R. Shaw 24-May-18 13:17pm View

The return type should not be const.
T& T::operator=(const T&)

John R. Shaw 8-Aug-11 23:41pm View

5 - Good answer. If nothing else has changed, then it will probably be the same address. But, like you said, there is no guarantee.

John R. Shaw 8-Aug-11 23:22pm View

int* first = &ar[0]; int* last = &ar[10];
range = [first, last)
last marks the end of the range, but is not in the range.
actual range = [first, last-1]
last is no more valid than last+1; it is just the address following the last valid address.

John R. Shaw 23-Jul-11 12:29pm View

5 - good answer

John R. Shaw 23-Jul-11 12:25pm View

Sorry 3 - it was a 4 for unneeded 'new' in the loop, but dropped to 3 because it will leak - no 'delete'.

John R. Shaw 18-Jul-11 16:39pm View

Deleted

Reason for my vote of 5
Nice, clean and simple for beginners. Good job!

John R. Shaw 16-Jul-11 12:13pm View

Actually they are not obsolete. I know Unicode encoding in depth (bmp, surrogates, etc.) - I have done internationalization. Encoding in Big5 and Traditional Chinese as well as Shift-Jis are still around and need conversion into Unicode. The newer C standard (see Draft N1494) does provide new Unicode specific functions in clause 7.27 and under the hood the STL usually calls the C-functions.

John R. Shaw 15-Jul-11 13:58pm View

Basically - you do need to create a scan-line list to use the normal method - which relies on knowing the coordinates of the edges.

Example line to fill:
[0][0] = 1, ..., [0][10] = 1, [0][11] = 1, [0][12] = 1

in MyPoint list that would be
list[0] = {0,0}; // left
list[1] = {0,10}; // right

In this case we do not want [0][11] or [0][12] in our list.

The method you are currently using would work, but resembles a flood fill. May be a look at the diagrams in my QuickFill article at codeproject would give you a better idea.

John R. Shaw 15-Jul-11 13:32pm View

Cool! Thanks for the link. It looks like you found what you were looking for.

John R. Shaw 15-Jul-11 12:42pm View

Not exactly, but there are lots of java libraries out there - try search for "java statechart".

I found this http://sourceforge.net/projects/state4j/

John R. Shaw 15-Jul-11 9:53am View

Doh! Thanks :D

John R. Shaw 14-Jul-11 21:20pm View

In your example - you could simply make the array "static int arr[10]" - as long as it is not changed by the next call to the function, there is no problem.

If you are going to allocate memory, then you might as well use vector. To avoid copy on return - pass a reference to a vector as an argument - it's more efficient.

John R. Shaw 14-Jul-11 21:04pm View

Read the question. Christian has it right. The question was "I am not getting any error why?". In other words, why was there no error when accessing the array after it was popped off the stack [deleted].

John R. Shaw 14-Jul-11 20:53pm View

I give - it insist on adding </vector> to the end - I the rest looks fixed.

John R. Shaw 13-Jul-11 18:06pm View

Strange I do not see what strcpy has to do with the question. But the while loop would be more efficient.

Comments by John R. Shaw (Top 26 by date)