C++: Comparing Substrings In An Array

[Ying Yang]

Hi,

What do i use to solve the following problem:

Pseudocode:

if my array of char contains a substring that is equal to string X
{
increment counter;
}
else do not increment counter.


Regards
KLJ

[Ying Yang]

Re: Comparing Substrings In An Array


[color=blue]
> Hi,
>
> What do i use to solve the following problem:
>
> Pseudocode:
>
> if my array of char contains a substring that is equal to string X
> {
> increment counter;
> }
> else do not increment counter.[/color]

I forgot to add that i would like to do it without using the string data
type if possible.


Regardsd
tyu

[Attila Feher]

Re: Comparing Substrings In An Array

Ying Yang wrote:[color=blue]
> Hi,
>
> What do i use to solve the following problem:
>
> Pseudocode:
>
> if my array of char contains a substring that is equal to string X
> {
> increment counter;
> }
> else do not increment counter.[/color]

if I use the strstr function to check if my array of char
contains a substring that is equal to string X
{
++counter;
}


--
Attila aka WW

[Thomas Matthews]

Re: Comparing Substrings In An Array

Ying Yang wrote:[color=blue][color=green]
>>Hi,
>>
>>What do i use to solve the following problem:
>>
>>Pseudocode:
>>
>>if my array of char contains a substring that is equal to string X
>>{
>> increment counter;
>>}
>>else do not increment counter.[/color]
>
>
> I forgot to add that i would like to do it without using the string data
> type if possible.
>
>
> Regardsd
> tyu
>
>[/color]

strstr.


--
Thomas Matthews

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[Chris Dams]

Re: Comparing Substrings In An Array

"Ying Yang" <YingYang@hotma il.com> writes:

Hello,
[color=blue][color=green]
>> Hi,
>>
>> What do i use to solve the following problem:
>>
>> Pseudocode:
>>
>> if my array of char contains a substring that is equal to string X
>> {
>> increment counter;
>> }
>> else do not increment counter.[/color][/color]
[color=blue]
>I forgot to add that i would like to do it without using the string data
>type if possible.[/color]

If the string in your array of char is null terminated, you can use

STRSTR(3) Linux Programmer's Manual STRSTR(3)



NAME
strstr - locate a substring

SYNOPSIS
#include <string.h>

char *strstr(const char *haystack, const char *needle);

DESCRIPTION
The strstr() function finds the first occurrence of the
substring needle in the string haystack. The terminating
`\0' characters are not compared.

RETURN VALUE
The strstr() function returns a pointer to the beginning
of the substring, or NULL if the substring is not found.

Bye,
Chris Dams

[Default User]

Re: Comparing Substrings In An Array

Ying Yang wrote:
[color=blue]
> I forgot to add that i would like to do it without using the string data
> type if possible.[/color]


Why? In C++, you should strive to use std::string whenever possible,
unless there is an overriding reason not to do so. Please explain your
special circumstances. That will help us give an accurate answer.




Brian Rodenborn

[A]

Re: Comparing Substrings In An Array

> Ying Yang wrote:[color=blue]
>[color=green]
> > I forgot to add that i would like to do it without using the string data
> > type if possible.[/color]
>
>
> Why? In C++, you should strive to use std::string whenever possible,
> unless there is an overriding reason not to do so. Please explain your
> special circumstances. That will help us give an accurate answer.
>
> Brian Rodenborn[/color]

I am learning C++ and since alot of code still contains reminants of C, it's
a good idea to learn how to use functions from the older c library before
moving on to the C++ library.

LKDjdfdfgdfgf


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[Gavin Deane]

Re: Comparing Substrings In An Array

"A" <A@iprimus.com. au> wrote in message news:<3f728ade_ 1@news.iprimus. com.au>...[color=blue][color=green]
> > Ying Yang wrote:
> >[color=darkred]
> > > I forgot to add that i would like to do it without using the string data
> > > type if possible.[/color]
> >
> >
> > Why? In C++, you should strive to use std::string whenever possible,
> > unless there is an overriding reason not to do so. Please explain your
> > special circumstances. That will help us give an accurate answer.
> >
> > Brian Rodenborn[/color]
>
> I am learning C++ and since alot of code still contains reminants of C, it's
> a good idea to learn how to use functions from the older c library before
> moving on to the C++ library.[/color]

"as well as", maybe, but not "before". As Brian said, you should be
using std::string in your own code unless you have a very good reason
not to (other peeple's avoidance of std::string is not a good reason).
You will encounter C-style strings in other people's code, but you
won't be in a position to be maintaining existing code until you've
learnt the languauge. std::string is fundamental to that.

If you want to learn C, learn C. If you want to learn C++, learn C++.
That will involve learning things like C-style strings their library
functions, but that is an advanced C++ topic.

If you want to learn C and C++ at the same time without confusing
yourself to death, you're braver than I am :)

GJD

[A]

Re: Comparing Substrings In An Array

[color=blue][color=green][color=darkred]
> > > Ying Yang wrote:
> > >
> > > > I forgot to add that i would like to do it without using the string[/color][/color][/color]
data[color=blue][color=green][color=darkred]
> > > > type if possible.
> > >
> > >
> > > Why? In C++, you should strive to use std::string whenever possible,
> > > unless there is an overriding reason not to do so. Please explain your
> > > special circumstances. That will help us give an accurate answer.
> > >
> > > Brian Rodenborn[/color]
> >
> > I am learning C++ and since alot of code still contains reminants of C,[/color][/color]
it's[color=blue][color=green]
> > a good idea to learn how to use functions from the older c library[/color][/color]
before[color=blue][color=green]
> > moving on to the C++ library.[/color]
>
> "as well as", maybe, but not "before". As Brian said, you should be
> using std::string in your own code unless you have a very good reason
> not to (other peeple's avoidance of std::string is not a good reason).
> You will encounter C-style strings in other people's code, but you
> won't be in a position to be maintaining existing code until you've
> learnt the languauge. std::string is fundamental to that.[/color]

Point taken.


Regards
erer




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[Mike Wahler]

Re: Comparing Substrings In An Array

"A" <A@iprimus.com. au> wrote in message
news:3f728ade_1 @news.iprimus.c om.au...[color=blue][color=green]
> > Ying Yang wrote:
> >[color=darkred]
> > > I forgot to add that i would like to do it without using the string[/color][/color][/color]
data[color=blue][color=green][color=darkred]
> > > type if possible.[/color]
> >
> >
> > Why? In C++, you should strive to use std::string whenever possible,
> > unless there is an overriding reason not to do so. Please explain your
> > special circumstances. That will help us give an accurate answer.
> >
> > Brian Rodenborn[/color]
>
> I am learning C++ and since alot of code still contains reminants of C,[/color]
it's[color=blue]
> a good idea to learn how to use functions from the older c library before[/color]

After.
[color=blue]
> moving[/color]
[color=blue]
>on[/color]

immediately
[color=blue]
> to the C++ library.[/color]

-Mike