Re: How to egalise two strings - C / C++ / MFC Discussion Boards

Re: How to egalise two strings

Rage27-Jul-07 2:56

Rage

27-Jul-07 2:56

Francais et en stage au Portugal ?

Don't follow any man spiritually, don't do anything that will get you in sh*t if god is real - Bradml[^]

Re: How to egalise two strings

garfaoui27-Jul-07 2:57

garfaoui

27-Jul-07 2:57

tout a fait =) Big Grin | :-D

Re: How to egalise two strings

Rage27-Jul-07 3:01

Rage

27-Jul-07 3:01

Te laisse pas impressioner par Tox, il est dur, mais très très fort. Poke tongue | ;-P

Don't follow any man spiritually, don't do anything that will get you in sh*t if god is real - Bradml[^]

Re: How to egalise two strings

garfaoui27-Jul-07 3:09

garfaoui

27-Jul-07 3:09

Ne t´inquète pas!
En tout cas il m´a bien aidé!
C´est par rapport au repertoire de l´executable que tu as vu que j´étais au Portugal?

Re: How to egalise two strings

toxcct27-Jul-07 3:14

toxcct

27-Jul-07 3:14

non, par rapport a ton profil ^^

@Régis, merci pr la petite note d'humour... "il est tres tres fort", c'est a double tranchant ca Poke tongue | ;-P

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Re: How to egalise two strings

Rage27-Jul-07 3:21

Rage

27-Jul-07 3:21

Don't follow any man spiritually, don't do anything that will get you in sh*t if god is real - Bradml[^]

Re: How to egalise two strings

Rage27-Jul-07 3:20

Rage

27-Jul-07 3:20

Nope, c'est dans ta biographie (clique sur l'icone en forme de tete a cote de ton nom)

Don't follow any man spiritually, don't do anything that will get you in sh*t if god is real - Bradml[^]

Re: How to egalise two strings

garfaoui27-Jul-07 2:19

garfaoui

27-Jul-07 2:19

Shilpi Boosar wrote:
if(strcmp(s1,s2)==0)

lead to the following error: <;146 C:\Documents and Settings\garfaoui\Ambiente de trabalho\test\clippr\main.cpp no matching function for call to `strcmp(std::string&, std::string&)' >

Re: How to egalise two strings

ShilpiP27-Jul-07 2:51

ShilpiP

27-Jul-07 2:51

string s1 = "shilpi";
string s2 = "shilpi";

if(strcmp(s1.c_str(),s2.c_str())==0)
{
printf("Hi");
}

what i wanna say is this ,try it

Yes U Can ...If U Can ,Dream it , U can do it ...ICAN

two dimensional array initialization

George_George26-Jul-07 23:35

George_George

26-Jul-07 23:35

Hello everyone,

I find to initialize two dimentional array in Visual Studio, I have to specify the number of elements. For example,

<br />
const char foo[][] = {"hello",  "world"}; // compile error<br />
const char goo[][64] = {"hello",  "world"}; // compile correct<br />

So, the best solution is to specify the number of elements of the 2nd dimension (inner dimension)?

thanks in advance,
George

Re: two dimensional array initialization [modified]

toxcct26-Jul-07 23:46

toxcct

26-Jul-07 23:46

the best ?

std::vector<std::vector<std::string> >

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Re: two dimensional array initialization

George_George27-Jul-07 0:17

George_George

27-Jul-07 0:17

Thanks toxcct,

I need to use C other than C++. What do you think is the best solution in C?

regards,
George

Re: two dimensional array initialization

codeII27-Jul-07 0:21

codeII

27-Jul-07 0:21

Dynamic you can do it something like this:

int nNmbOfStrings = 2;
int nI;

LPTSTR* pArr = new LPTSTR[ nNmbOfStrings ];

pArr[ 0 ] = new TCHAR[ _tcslen( _T("hello") ) + 1 ];
pArr[ 1 ] = new TCHAR[ _tcslen( _T("world") ) + 1 ];

_tcscpy( pArr[ 0 ], _T("hello") );
_tcscpy( pArr[ 1 ], _T("world") );

//deletion:
for ( nI = 0; nI < nNmbOfStrings; nI++ )
{
delete [] pArr[ nI ];
pArr[ nI ] = NULL;
}
delete [] pArr;
pArr = NULL;

Re: two dimensional array initialization

George_George27-Jul-07 0:37

George_George

27-Jul-07 0:37

Thanks koos,

It works but a little complex.

regards,
George

Re: two dimensional array initialization

codeII27-Jul-07 1:22

codeII

27-Jul-07 1:22

Yep,

It only makes sence when you dynamically want assign/reassign an array.

//f.i. reassign string 2 (before deletion!):
delete [] pArr[ 1 ];
pArr[ 1 ] = new TCHAR[ _tcslen( _T("Every body") ) + 1 ];
_tcscpy( pArr[ 1 ], _T("Every body") );

Regards,

Koos

Re: two dimensional array initialization

George_George27-Jul-07 20:03

George_George

27-Jul-07 20:03

Thanks koos,

I am aware that your method has advantage.

regards,
George

Re: two dimensional array initialization

Rage26-Jul-07 23:53

Rage

26-Jul-07 23:53

George_George wrote:
const char foo[][] = {"hello", "world"}; // compile error
const char goo[][64] = {"hello", "world"}; // compile correc

const char *foo[]= {"hello","world"};

Don't follow any man spiritually, don't do anything that will get you in sh*t if god is real - Bradml[^]

Re: two dimensional array initialization

George_George27-Jul-07 0:19

George_George

27-Jul-07 0:19

Cool!

regards,
George

Re: two dimensional array initialization

Michael Dunn27-Jul-07 10:08

Michael Dunn

27-Jul-07 10:08

Keep in mind that George's solution is not the same as your original code. Most notably, you shouldn't write to any of the memory occupied by the strings, whereas with regular arrays, it's always safe to write to that memory.

--Mike--
Visual C++ MVP Cool | :cool:

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Re: two dimensional array initialization

George_George27-Jul-07 20:10

George_George

27-Jul-07 20:10

Thanks Mike,

1. Why his solution is not the same as mine?

2. How memory corruption will occur? Could you let me know an example please? I am using the array as constant string, so I can not imagine a case which will cause memory corruption.

regards,
George

Re: two dimensional array initialization

Michael Dunn28-Jul-07 9:40

Michael Dunn

28-Jul-07 9:40

char s1[] = "foo";
char* s2 = "bar";
strcpy ( s1, "aaa" ); // ok
strcpy ( s2, "bbb" ); // not ok

The memory pointed to by s2 should be treated as read-only.

--Mike--
Visual C++ MVP Cool | :cool:

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Dunder-Mifflin, this is Pam.

Re: two dimensional array initialization

George_George28-Jul-07 19:36

George_George

28-Jul-07 19:36

Good point! Thanks Mike! I have not noticed this point before.

regards,
George

Re: two dimensional array initialization

Michael Dunn27-Jul-07 10:07

Michael Dunn

27-Jul-07 10:07

If you want to stick with fixed-sized array bounds, you have to specify all bounds except the first. That's why [][] is an error but [][64] is OK.

--Mike--
Visual C++ MVP Cool | :cool:

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Re: two dimensional array initialization

George_George27-Jul-07 20:07

George_George

27-Jul-07 20:07

Thanks Mike,

Could you explain from compiler internal point of view why I need to provide the innermost size, why I can not make it empty (e.g. [][])? I think it must break some rules or make compiler confused to make proper decision to generate object code, but I can not find why.

regards,
George

Re: two dimensional array initialization

Michael Dunn28-Jul-07 9:56

Michael Dunn

28-Jul-07 9:56

char s1[4] = "cat";
char s2[] = "dog";

In both of those cases, the array size is 4. The compiler can deduce the size of s2 from the initializer string, which is 4 chars long.

char* s3[2] = { "hello", "bob" };
char* s4[] = { "code", "project" };

Here, the arrays contain char*. Again, the compiler can deduce the size of s4 because the initializer has two char*s.
Now make it a 2-D array (I'll switch to ints since the initializer syntax is more precise)

int i5[5][2] = { {1,2,3,4,5}, {6,7,8,9,10} };

i5 is an array of two int[5] arrays. Now if I did this:

int i6[5][] = { {1,2,3,4,5}, {6,7,8,9,10}, {0,2,4,6,8} };

Since I used three int[5] arrays in the initializer, the compiler deduces that i6 is int[5][3]. (BTW I just realized that my earlier post was wrong, it's the last dimension that you can leave out, not the first.)

--Mike--
Visual C++ MVP Cool | :cool:

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Dunder-Mifflin, this is Pam.

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