Seperate string into 2 based on last + sign in the string

JuzMe · 04-18-2009, 03:00 AM

Hi,

If I have this string 'Hello+Julie+I-was-here', how do I get this expecting result with C programming?

'Hello+Julie'

'I-was-here'

Another example,

String: 'I+am+really+tired+mememe-is-now-at-home'

Result:

'I+am+really+tired'
'mememe-is-now-at-home'

As noticed, I will want to break up my string into 2. Based on the last + sign from the back in the string, I will separate the string into 2 separate strings. How am I suppose to do this?

EVOEx · 04-18-2009, 03:50 AM

Erm... What about looping through the string, mark the last + you found, replace it by a null character, and add one to get the second string..?
You could copy the string, which you have to if it's a constant string, but if not it's too much overhead.
Although, 99% of the cases the string should really be constant in this case

.

JuzMe · 04-18-2009, 03:51 AM

Quote:

Originally Posted by EVOEx

Erm... What about looping through the string, mark the last + you found, replace it by a null character, and add one to get the second string..?
You could copy the string, which you have to if it's a constant string, but if not it's too much overhead.
Although, 99% of the cases the string should really be constant in this case

.

Sorry but how do I actually code that? I am really new to this C programming and so I am not so sure about it.

Adak · 04-18-2009, 04:03 AM

Before you can learn any trick riding skills, you have learn how to actually ride the horse, a little.

This requires using a string (a char array[]), and working with an index with that array - not the only way but probably the simplest.

Learn about using a char array and an index, and how to print a string, and a newline. Then your answer will be made clear to you, and you will have learned something valuable in the process.

JuzMe · 04-18-2009, 04:52 AM

Quote:

Originally Posted by Adak

Before you can learn any trick riding skills, you have learn how to actually ride the horse, a little.

This requires using a string (a char array[]), and working with an index with that array - not the only way but probably the simplest.

Learn about using a char array and an index, and how to print a string, and a newline. Then your answer will be made clear to you, and you will have learned something valuable in the process.

Ok, do you have any reference that I can refer to?

Adak · 04-18-2009, 05:29 AM

A good place to start is Ivor Horton's book - "Beginning C".

Covers all the basics, in a down to earth style. Also, has several examples of great problem solving, using the basics discussed in the previous chapters.

K&R "The C Programming Language" is excellent, but not for beginners.

There are many C tutorials on-line, but you'll have to Google them up.

JuzMe · 04-18-2009, 05:31 AM

Actually, it is not say I do not want to learn. But I am stuck and rushing to meet the dateline so I do not have time to look for these books.... Is ok.... I will look at other places.

JuzMe · 04-18-2009, 06:02 AM

I am really sorry..... I am really desperate for help... Can anyone guide me what I should really do? I don't even know how to begin.

vart · 04-18-2009, 06:22 AM

use strrchr to find the last '+' character and then replace it with 0 (like strtok does) or strncpy first part of the string to the side...

JuzMe · 04-18-2009, 07:02 AM

Quote:

Originally Posted by vart

use strrchr to find the last '+' character and then replace it with 0 (like strtok does) or strncpy first part of the string to the side...

Hi Vart,

Thanks for your help.

But I need your help further.

For this string:

String: 'I+am+really+tired+mememe-is-now-at-home'

With strrchr, I was able to get 'mememe-is-now-at-home'.

But the problem is how do I get I+am+really+tired?

Does anyone knows about it?

BEN10 · 04-18-2009, 07:12 AM

Quote:

Originally Posted by JuzMe

Hi Vart,

Thanks for your help.

But I need your help further.

For this string:

String: 'I+am+really+tired+mememe-is-now-at-home'

With strrchr, I was able to get 'mememe-is-now-at-home'.

But the problem is how do I get I+am+really+tired?

Does anyone knows about it?

show the code u have made till now.

Brafil · 04-18-2009, 07:19 AM

that's easy. Like vart said:

Code:

char *end = strrchr(string, '+');            /* Get the last occurrence of '+' */
end[0] = '\0';                               /* Replace it with a nul byte */
end++;                                       /* Skip it */

string is I+am+really+tired, and end is mememe-is-now-at-home

JuzMe · 04-20-2009, 06:44 AM

Thank you. It works

04-18-2009, 03:00 AM	#1
JuzMe Registered User Join Date: Apr 2009 Posts: 13	Seperate string into 2 Hi, If I have this string 'Hello+Julie+I-was-here', how do I get this expecting result with C programming? 'Hello+Julie' 'I-was-here' Another example, String: 'I+am+really+tired+mememe-is-now-at-home' Result: 'I+am+really+tired' 'mememe-is-now-at-home' As noticed, I will want to break up my string into 2. Based on the last + sign from the back in the string, I will separate the string into 2 separate strings. How am I suppose to do this? Last edited by JuzMe; 04-18-2009 at 03:49 AM.
JuzMe is offline

04-18-2009, 03:50 AM	#2
EVOEx Registered User Join Date: Oct 2008 Posts: 452	Erm... What about looping through the string, mark the last + you found, replace it by a null character, and add one to get the second string..? You could copy the string, which you have to if it's a constant string, but if not it's too much overhead. Although, 99% of the cases the string should really be constant in this case .
EVOEx is offline

04-18-2009, 04:03 AM	#4
Adak Registered User Join Date: Sep 2006 Posts: 2,512	Before you can learn any trick riding skills, you have learn how to actually ride the horse, a little. This requires using a string (a char array[]), and working with an index with that array - not the only way but probably the simplest. Learn about using a char array and an index, and how to print a string, and a newline. Then your answer will be made clear to you, and you will have learned something valuable in the process.
Adak is offline

04-18-2009, 05:29 AM	#6
Adak Registered User Join Date: Sep 2006 Posts: 2,512	A good place to start is Ivor Horton's book - "Beginning C". Covers all the basics, in a down to earth style. Also, has several examples of great problem solving, using the basics discussed in the previous chapters. K&R "The C Programming Language" is excellent, but not for beginners. There are many C tutorials on-line, but you'll have to Google them up.
Adak is offline

04-18-2009, 05:31 AM	#7
JuzMe Registered User Join Date: Apr 2009 Posts: 13	Actually, it is not say I do not want to learn. But I am stuck and rushing to meet the dateline so I do not have time to look for these books.... Is ok.... I will look at other places.
JuzMe is offline

04-18-2009, 06:02 AM	#8
JuzMe Registered User Join Date: Apr 2009 Posts: 13	I am really sorry..... I am really desperate for help... Can anyone guide me what I should really do? I don't even know how to begin.
JuzMe is offline

04-18-2009, 06:22 AM	#9
vart CSharpener Join Date: Oct 2006 Posts: 5,242	use strrchr to find the last '+' character and then replace it with 0 (like strtok does) or strncpy first part of the string to the side... __________________ If I have eight hours for cutting wood, I spend six sharpening my axe.
vart is offline

04-18-2009, 07:19 AM	#12
Brafil Making mistakes Join Date: Dec 2008 Posts: 347	that's easy. Like vart said: Code: char end = strrchr(string, '+'); / Get the last occurrence of '+' / end[0] = '\0'; / Replace it with a nul byte / end++; / Skip it */ string is I+am+really+tired, and end is mememe-is-now-at-home
Brafil is offline

04-20-2009, 06:44 AM	#13
JuzMe Registered User Join Date: Apr 2009 Posts: 13	Thank you. It works
JuzMe is offline

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