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String->Number
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zeldaking


Power User


Joined: 31 Jul 2011
Posts: 470
Location: Utah
Posted: 25 Jun 2012 11:04:35 am    Post subject: String->Number
Hi everyone, I have a Ti-Basic related question concerning strings. I need a String to number converter, meaning the string comprises of numbers and I want it to easily convert to an appropiate number. Here is some help to understand it.

Code:

:"123456->Str1
:Length(Str1)->Dim(LNUM
://LNUM is a list, named NUM
:For(A,1,Length(Str1
:sub(Str1,A,1->LNUM(A
://Invalid but the point... does anyone know how to convert easily?
:End

What I did:

Code:

:"12345->Str1
:Length(Str1)->dim(LNUM
:For(A,1,Length(Str1
:sub(Str1,A,1)->Str0
:If Str0="1
:1->B
:If Str0="2
:2->B
:If Str0="3
:3->B
://etc
:B->LNUM(A
:End

My way is pretty slow and not very effecient, does any one have a good optimized (fast) way? Thanks.
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souvik1997


Guru-in-Training


Joined: 19 Apr 2010
Posts: 2870
Posted: 25 Jun 2012 11:08:25 am    Post subject:
expr() should do the trick.
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merthsoft


File Archiver


Joined: 09 May 2010
Posts: 2735
Posted: 25 Jun 2012 11:08:39 am    Post subject:
You can use the expr( command. So:

Code:
expr("123

Will return the number 123.
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Shaun
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zeldaking


Power User


Joined: 31 Jul 2011
Posts: 470
Location: Utah
Posted: 25 Jun 2012 11:12:12 am    Post subject:
So:

Code:

:expr(sub(Str1,A,1))->LNUM(A

Thanks guys.
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merthsoft


File Archiver


Joined: 09 May 2010
Posts: 2735
Posted: 25 Jun 2012 11:13:13 am    Post subject:

Code:
expr(sub(Str1,A,1->LNUM(A
Would be even better (saves 2 bytes). And, depending on how you're actually using it, if you can have the numbers already with commas, you wouldn't even need a loop:

Code:
"1,2,3,4,15->Str1
expr("{"+Str1->LNUM

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Shaun
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blue_bear_94


Member


Joined: 20 Apr 2012
Posts: 162
Posted: 25 Jun 2012 12:07:31 pm    Post subject:
merthsoft wrote:

Code:
expr(sub(Str1,A,1->LNUM(A
Would be even better (saves 2 bytes).[/code]

It's 3 bytes, not 2.
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merthsoft


File Archiver


Joined: 09 May 2010
Posts: 2735
Posted: 25 Jun 2012 12:47:05 pm    Post subject:
I removed two parens, how does that save 3 bytes?
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Shaun
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KermMartian


Site Admin


Joined: 14 Mar 2005
Posts: 55742
Location: Earth, Sol, Milky Way
Posted: 25 Jun 2012 01:03:50 pm    Post subject:
merthsoft wrote:
I removed two parens, how does that save 3 bytes?
I think it's just Blue_Bear failing to read posts carefully, as usual. Wink Take a look at my Graph3DP topic for more examples of that. It's definitely 2 bytes.
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graphmastur


Power User


Joined: 27 Jul 2010
Posts: 464
Posted: 25 Jun 2012 06:39:12 pm    Post subject:
I believe he assumed there was a parenthesis at the end after the A.
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blue_bear_94


Member


Joined: 20 Apr 2012
Posts: 162
Posted: 26 Jun 2012 10:49:11 am    Post subject:
Yes. I stand corrected.
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