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Guest
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 Posted: Wed Jul 26, 2006 9:10 am Post subject: Can i create a constructor in a data structure? |
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Can i create a constructor in a data structure? does the following
codes right?
sample code
#include <iostream.h>
struct USERID{
char UserName[4];
char Password[7];
char LoginName[21];
char LoginPassword[11];
USERID( ){
UserName[0]= '\0';
Password[0]= '\0';
LoginName[0]= '\0';
LoginPassword[0]= '\0';}}; |
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Stuart Redmann
Guest
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| Posted: Wed Jul 26, 2006 9:10 am Post subject: Re: Can i create a constructor in a data structure? |
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fuiwong (AT) gmail (DOT) com wrote:
| Quote: | Can i create a constructor in a data structure? does the following
codes right?
sample code
#include <iostream.h
struct USERID{
char UserName[4];
char Password[7];
char LoginName[21];
char LoginPassword[11];
USERID( ){
UserName[0]= '\0';
Password[0]= '\0';
LoginName[0]= '\0';
LoginPassword[0]= '\0';}};
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Of course this is right. Keep in mind that under C++ a struct is
basically treated as a class except that you cannot use the access
modifiers like 'public:', 'protected:', or 'private:', because all
members of the struct are public. You may add other methods, even
virtual ones.
Regards,
Stuart |
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Ian Collins
Guest
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| Posted: Wed Jul 26, 2006 9:10 am Post subject: Re: Can i create a constructor in a data structure? |
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fuiwong (AT) gmail (DOT) com wrote:
| Quote: | Can i create a constructor in a data structure? does the following
codes right?
sample code
#include <iostream.h
struct USERID{
char UserName[4];
char Password[7];
char LoginName[21];
char LoginPassword[11];
USERID( ){
UserName[0]= '\0';
Password[0]= '\0';
LoginName[0]= '\0';
LoginPassword[0]= '\0';}};
It's legal, but why not use std::string and avoid the messy initialisations? |
--
Ian Collins. |
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Alf P. Steinbach
Guest
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| Posted: Wed Jul 26, 2006 9:10 am Post subject: Re: Can i create a constructor in a data structure? |
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* fuiwong (AT) gmail (DOT) com:
| Quote: | Can i create a constructor in a data structure? does the following
codes right?
sample code
#include <iostream.h
struct USERID{
char UserName[4];
char Password[7];
char LoginName[21];
char LoginPassword[11];
USERID( ){
UserName[0]= '\0';
Password[0]= '\0';
LoginName[0]= '\0';
LoginPassword[0]= '\0';}};
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Others have commented on your constructor: it's OK.
However, your code will not compile with some newer compilers unless you
change
#include <iostream.h>
to
#include <iostream>
or define an <iostream.h> header yourself -- it's not standard.
Second, it's generally a Good Idea(TM) to reserve all uppercase for macros.
Third, but this has already been remarked on, you'll save a lot of work
and anguish by using std::string instead of raw character arrays.
--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail? |
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Kai-Uwe Bux
Guest
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| Posted: Wed Jul 26, 2006 9:11 am Post subject: Re: Can i create a constructor in a data structure? |
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Stuart Redmann wrote:
| Quote: | fuiwong (AT) gmail (DOT) com wrote:
Can i create a constructor in a data structure? does the following
codes right?
sample code
#include <iostream.h
struct USERID{
char UserName[4];
char Password[7];
char LoginName[21];
char LoginPassword[11];
USERID( ){
UserName[0]= '\0';
Password[0]= '\0';
LoginName[0]= '\0';
LoginPassword[0]= '\0';}};
Of course this is right. Keep in mind that under C++ a struct is
basically treated as a class except that you cannot use the access
modifiers like 'public:', 'protected:', or 'private:', because all
members of the struct are public.
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This is incorrect. All access specifiers are at your disposal. What differs
is the default: in struct, members are public by default.
| Quote: | You may add other methods, even virtual ones.
|
That is correct.
Best
Kai-Uwe Bux |
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