| View previous topic :: View next topic |
| Author |
Message |
Mikael S. H.
Guest
|
 Posted: Sun Jan 29, 2006 12:00 am Post subject: Rot-13 encoding an std::string |
 |
|
I there a function in the string class to replace an 'a' with an 'm', or
something similar?
Will I have to write a function iterating over every character in the
string to rot-13 encoding a string?
--
MikaelSh |
|
| Back to top |
|
 |
Jim Langston
Guest
|
| Posted: Sun Jan 29, 2006 12:00 am Post subject: Re: Rot-13 encoding an std::string |
|
|
"Mikael S. H." <mikael (AT) alminde (DOT) org> wrote in message
news:43dbf94d$0$4820$ba624c82 (AT) nntp02 (DOT) dk.telia.net...
| Quote: | I there a function in the string class to replace an 'a' with an 'm', or
something similar?
Will I have to write a function iterating over every character in the
string to rot-13 encoding a string?
--
MikaelSh
|
std::string MyString = "This is a test. 123. $%*"
for ( int i = 0; i < MyString.length(); ++i )
MyString[i] = MyString[i] + 13;
This should do it, and I don't beleive you even have to worry about
overflow.
I think you could use the for_each also, but I don't use those so don't know
the correct syntax.
Of course, the only thing I know about rot-13 is that it adds 13 to the
characters. I think it does special cases for unprintable characters (0 to
25?) and other ones so it can be sent as pure text. You'll need to get the
full details of rot-13 to find the specifics. |
|
| Back to top |
|
|
Jim Langston
Guest
|
| Posted: Sun Jan 29, 2006 12:00 am Post subject: Re: Rot-13 encoding an std::string |
|
|
"Jim Langston" <tazmaster (AT) rocketmail (DOT) com> wrote in message
news:4nTCf.136$Zl7.29 (AT) fe02 (DOT) lga...
| Quote: | "Mikael S. H." <mikael (AT) alminde (DOT) org> wrote in message
news:43dbf94d$0$4820$ba624c82 (AT) nntp02 (DOT) dk.telia.net...
I there a function in the string class to replace an 'a' with an 'm', or
something similar?
Will I have to write a function iterating over every character in the
string to rot-13 encoding a string?
--
MikaelSh
std::string MyString = "This is a test. 123. $%*"
for ( int i = 0; i < MyString.length(); ++i )
MyString[i] = MyString[i] + 13;
This should do it, and I don't beleive you even have to worry about
overflow.
I think you could use the for_each also, but I don't use those so don't
know the correct syntax.
Of course, the only thing I know about rot-13 is that it adds 13 to the
characters. I think it does special cases for unprintable characters (0
to 25?) and other ones so it can be sent as pure text. You'll need to get
the full details of rot-13 to find the specifics.
|
I actually went and spent the 30 seconds after I typed this to see what
rot-13 actually did. It seems it only applies to 'a' thorugh 'z' and 'A'
throught 'Z'. Of course it even had source code.
http://b-con.us/code/rot-13_c.php
A simple STFW found this. |
|
| Back to top |
|
|
Jim Langston
Guest
|
| Posted: Sun Jan 29, 2006 2:00 am Post subject: Re: Rot-13 encoding an std::string |
|
|
"Peteris Krumins" <peteris.krumins (AT) gmail (DOT) com> wrote in message
news:1138497793.883097.264410 (AT) g49g2000cwa (DOT) googlegroups.com...
| Quote: | Mikael S. H. wrote:
I there a function in the string class to replace an 'a' with an 'm', or
something similar?
Will I have to write a function iterating over every character in the
string to rot-13 encoding a string?
Here is an example code that creates new data type 'rot_string' which
upon instantiation
rot13'es a string.
#include <string
#include <cctype
#include <iostream
struct rot_char_traits : public std::char_traits<char
{
static char *copy(char *s1, const char *s2, size_t n) {
while (n--) *s1++ = isalpha(*s2 + 13) ? *s2++ + 13 : *s2++ -
13;
return s1 - n;
|
n at this point should be 0 since while (n--). So this will simply return
s1 which will be pointing off the end of the string. Suggest copy s1 in
beginning to return here or copy n to use in return here, or copy n to
another var and decrement that instead. |
|
| Back to top |
|
|
Peteris Krumins
Guest
|
| Posted: Sun Jan 29, 2006 2:00 am Post subject: Re: Rot-13 encoding an std::string |
|
|
Peteris Krumins wrote:
| Quote: | Mikael S. H. wrote:
I there a function in the string class to replace an 'a' with an 'm', or
something similar?
Will I have to write a function iterating over every character in the
string to rot-13 encoding a string?
Here is an example code that creates new data type 'rot_string' which
upon instantiation
rot13'es a string.
#include <string
#include <cctype
#include <iostream
struct rot_char_traits : public std::char_traits<char
{
static char *copy(char *s1, const char *s2, size_t n) {
while (n--)
*s1++ = isalpha(*s2 + 13) ? *s2++ + 13 : *s2++ - 13;
return s1 - n;
^ bug  |
P.Krumins |
|
| Back to top |
|
|
Peteris Krumins
Guest
|
| Posted: Sun Jan 29, 2006 2:00 am Post subject: Re: Rot-13 encoding an std::string |
|
|
Mikael S. H. wrote:
| Quote: | I there a function in the string class to replace an 'a' with an 'm', or
something similar?
Will I have to write a function iterating over every character in the
string to rot-13 encoding a string?
|
Here is an example code that creates new data type 'rot_string' which
upon instantiation
rot13'es a string.
#include <string>
#include <cctype>
#include <iostream>
struct rot_char_traits : public std::char_traits<char>
{
static char *copy(char *s1, const char *s2, size_t n) {
while (n--) *s1++ = isalpha(*s2 + 13) ? *s2++ + 13 : *s2++ -
13;
return s1 - n;
}
};
typedef std::basic_string<char, rot_char_traits> rot_string;
int
main()
{
rot_string nun = "aha"; // "aha" rot13'ed is "nun"
rot_string sync = "flap"; // "flap" rot13'ed is "sync"
std::cout << nun.c_str() << "\n";
std::cout << sync.c_str() << "\n";
return 0;
}
P.Krumins |
|
| Back to top |
|
|
Peteris Krumins
Guest
|
| Posted: Sun Jan 29, 2006 3:00 am Post subject: Re: Rot-13 encoding an std::string |
|
|
yeap a bug.
had different code before, forgot about - n before posted.
P.Krumins |
|
| Back to top |
|
|
Jack Klein
Guest
|
| Posted: Mon Jan 30, 2006 12:00 am Post subject: Re: Rot-13 encoding an std::string |
|
|
On Sun, 29 Jan 2006 00:08:10 +0100, "Mikael S. H."
<mikael (AT) alminde (DOT) org> wrote in comp.lang.c++:
| Quote: | I there a function in the string class to replace an 'a' with an 'm', or
something similar?
Will I have to write a function iterating over every character in the
string to rot-13 encoding a string?
|
Remember that rot-13 would most likely do truly awful things on an
implementation that used something other than the ASCII character set.
--
Jack Klein
Home: http://JK-Technology.Com
FAQs for
comp.lang.c http://c-faq.com/
comp.lang.c++ http://www.parashift.com/c++-faq-lite/
alt.comp.lang.learn.c-c++
http://www.contrib.andrew.cmu.edu/~ajo/docs/FAQ-acllc.html |
|
| Back to top |
|
|
Stephen Howe
Guest
|
| Posted: Mon Jan 30, 2006 6:00 am Post subject: Re: Rot-13 encoding an std::string |
|
|
| Quote: | struct rot_char_traits : public std::char_traits<char
{
static char *copy(char *s1, const char *s2, size_t n) {
while (n--) *s1++ = isalpha(*s2 + 13) ? *s2++ + 13 : *s2++ -
13;
return s1 - n;
}
};
|
Consider what happens if s2 is pointing to a string which has "abc123xyz"
What happens to the non-alphabetical characters?
Is what happens consistent with ROT13 encoding?
Stephen Howe |
|
| Back to top |
|
|
Guest
|
| Posted: Mon Jan 30, 2006 3:00 pm Post subject: Re: Rot-13 encoding an std::string |
|
|
Jack Klein wrote:
| Quote: | On Sun, 29 Jan 2006 00:08:10 +0100, "Mikael S. H."
mikael (AT) alminde (DOT) org> wrote in comp.lang.c++:
Will I have to write a function iterating over every character in the
string to rot-13 encoding a string?
|
No. Just write a function that rot-13 encodes one character, and use it
with
std::transform.
| Quote: | Remember that rot-13 would most likely do truly awful things on an
implementation that used something other than the ASCII character set.
|
No. Dumb implementations may, though.
HTH,
Michiel Salters |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
