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Messages
Comments by Klaus-Werner Konrad (Top 19 by date)
Klaus-Werner Konrad
28-Mar-19 9:59am
View
"A decent compiler would produce a warning"
NO !!! printf is a function with a variable Count of Arguments, so a Compiler can never know how many Arguments are right ...
Klaus-Werner Konrad
21-Jan-19 9:50am
View
Looks for me like an (incomlete) implementation of a binary tree ...
Klaus-Werner Konrad
25-Sep-17 10:07am
View
Huh ...
int main(void)
{
uppercase_no_array("reverse");
return(0);
}
is CLEARLY a literal, not an command line argument
Klaus-Werner Konrad
13-Sep-17 11:22am
View
This would pretty sure lead to a Memory Access Violation; the Argument from main() is a string LITERAL ...
Klaus-Werner Konrad
5-Jul-17 6:51am
View
This will not work, because in C you can use Switch only with integral types, and a string in C is an ARRAY of characters ...
Klaus-Werner Konrad
9-May-17 10:55am
View
Should give at least a warning message: function 'message' has no return value
Klaus-Werner Konrad
22-Aug-13 20:11pm
View
Umm ... now I'm stunned
- C has no exception mechanism
- all possible values MUST be allowed, 'cause they are valid
what are the opportunities in your mind ?
(Remember, we're talking about pure C...
Klaus-Werner Konrad
22-Aug-13 19:16pm
View
"But it still leaves not 100% what to do it there are some digits, but parsing still fails due to invalid Format"
Well - the link I submitted states:
"If an underflow occurs, strtol() returns LONG_MIN. If an overflow occurs, strtol() returns LONG_MAX. In both cases, errno is set to ERANGE"
If the format is invalid, there is nothing to convert - dot
Klaus-Werner Konrad
22-Aug-13 19:03pm
View
"Anyway, thank you for all your comments" - I always enjoy a Logical conversion - thanks to you !
"I don't question your knowledge" - Very Kind; with 30+ years of C experience from my side everything else would make me really wonder :-)
About itoa:
- first, it's deprecated
- second, check the link (yes, Linux again) http://linux.die.net/man/3/atoi
where is clearly stated: "The behavior is the same as
strtol(nptr, NULL, 10); except that atoi() does not detect Errors"
Ok, it's a Little bit lame, but you should consider that all this functions are NOT C++ library but C library, and that is optimized for Speed. The standard library functions just assumes that you checked for pitfalls beforehand, and you should remember in this context, that C by itself is nothing more than the lowest possible level procedural language (aka high level ASM), aside from FORTH ...
Klaus-Werner Konrad
22-Aug-13 18:32pm
View
Well - for me it wasn't obvious, 'cause you never mentioned the link ...
If I come accross such a question, I Google first and follow multiple links. In this case, the third reference led to http://linux.die.net/man/3/strtol
and there it states
"If endptr is not NULL, strtol() stores the address of the first invalid character in *endptr. If there were no digits at all, strtol() stores the original value of nptr in *endptr (and returns 0)."
So, IMHO it's not the function that's lame, but the docuzmentation from the original link's site.
Klaus-Werner Konrad
22-Aug-13 17:52pm
View
Well - it returns an integer value, so to not exclude any possible value in the range there is no possibility to return an error value.
You haven't said WHY you think it's lame - THAT was my question ...
Klaus-Werner Konrad
21-Aug-13 17:39pm
View
Hi Sergey, I don't know exactly why you think it's lame, 'cause it is from the standard C library, and C don't know exceptions.
The only other passibility would be a additional pointer to the result so the function could return TRUE or FALSE
Klaus-Werner Konrad
19-Aug-13 7:29am
View
"0" will give you an other value in *endptr (*endptr == (ptr+1)) than "trash" (*endptr==ptr)
Klaus-Werner Konrad
1-Aug-13 4:13am
View
Reason for my vote of 2 \n Overly complicated, no use of TCHAR !
Klaus-Werner Konrad
27-May-13 14:12pm
View
No need to become so rude ...
Yes, I understand the elementary things, and - to repeat it - NO, the VTM is NOT an object,
It's right, the VTM itself is (mostly) implemented as an Array of function pointers, per class; nevertheless it's not an object, but a class member.
What I missed from your original Explanation was the fact, that every OBJECT (class instance) need a own pointer to this table; otherwise polumorphism wouldn't be possible.
Klaus-Werner Konrad
27-May-13 6:25am
View
SA wrote: "Virtual method table is actually an object, one per type (class/structure)."
That's really wrong !
The VMT is a hidden MEMBER of an OBJECT, i.e. it exists ONE PER OBJECT INSTANCE !!!
Klaus-Werner Konrad
6-Feb-13 12:25pm
View
Ok - YOU should THINK FIRST and THEN ask a question.
And, if someone requests more information about the subject, you should answer that request, so we are able to help you ...
You ask in C++ forum and say 'How can I do it in Visual Basic'.
You say 'I have only 2 (two) values, and you say 'binary values'.
NOW you talk about a collection of strings; that's something complete different.
So, please, try to describe what you really want to achieve, and specify the language you want to use for it
Klaus-Werner Konrad
6-Feb-13 10:36am
View
Worse - he wants to compress 2 bytes to 2 bits, so there are 65,532 other possible values :-)
Klaus-Werner Konrad
26-Jul-11 12:52pm
View
Deleted
This is nonsense - an index is only used based on the WHERE-clause, maybe the ORDER BY / GROUP BY clause, but NEVER EVER (except if all columns to deliver in the index) on the content that is to be selected, but it would be really unusual to have an index that spans all table columns !
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