# print("-5.3e - 10"*"2") doesnt work :/ Classic List Threaded 8 messages Open this post in threaded view
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## print("-5.3e - 10"*"2") doesnt work :/

 Here (http://www.lua.org/pil/2.4.html) you can find an example of using strings (print("-5.3e - 10"*"2")) but it doesn't work(attempt to perform arithmetic on a string value)... I use Lua 5.1. Generaly I want to use it to calculate strings (fe. "5+1+4" => print("5+1+4"+"0") should give 10 but it doesnt work.. :( ```Thanks for help Oldrich Svec ```
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## Re: print("-5.3e - 10"*"2") doesnt work :/

 ```On Thursday 27 April 2006 3:15 pm, Oldrich Svec wrote: > Here (http://www.lua.org/pil/2.4.html) you can find an example of using > strings (print("-5.3e - 10"*"2")) but it doesn't work(attempt to perform if this is scientific notation (-5.3 x 10^-10), remove the spaces around the '-' and it works ok. > arithmetic on a string value)... I use Lua 5.1. > Generaly I want to use it to calculate strings (fe. "5+1+4" => > print("5+1+4"+"0") should give 10 but it doesnt work.. :( use: function calcstring (s) local f = loadstring ("return "..s) return f and f() end print (calcstring ("5+1+4")) => 10 -- Javier ```Attachment: pgpF7dlrlt8pc.pgp Description: PGP signature
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## Re: print("-5.3e - 10"*"2") doesnt work :/

 In reply to this post by Oldrich Svec ```On 4/27/06, Oldrich Svec <[hidden email]> wrote: > Here (http://www.lua.org/pil/2.4.html) you can find an example of using > strings (print("-5.3e - 10"*"2")) but it doesn't work(attempt to perform > arithmetic on a string value)... I use Lua 5.1. > Generaly I want to use it to calculate strings (fe. "5+1+4" => > print("5+1+4"+"0") should give 10 but it doesnt work.. :( In this case, "-5.3e - 10" isn't recognized as a number. Try "-5.3e-10"*"2", which is recognized as a number. "5+1+4"+"0" doesn't work because "5+1+4" is not a number. You would have to do print("5"+"1"+"4"+"0") instead. -- Zachary P. Landau <[hidden email]> ```
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## Re: print("-5.3e - 10"*"2") doesnt work :/

 ```-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Zachary P. Landau wrote: [...] > In this case, "-5.3e - 10" isn't recognized as a number. Try > "-5.3e-10"*"2", which is recognized as a number. True, but those spaces are actually in the documentation, which makes the provided example not work --- a typesetting issue? - -- +- David Given --McQ-+ "If you're up against someone more intelligent | [hidden email] | than you are, do something insane and let him think | ([hidden email]) | himself to death." --- Pyanfar Chanur +- www.cowlark.com --+ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFEUU4Yf9E0noFvlzgRAp4rAKCXBOITxBFjzu2YtcY8XjwitmxAjACcDoxW PkVT8NoDj248mPhWReyXS04= =VWq0 -----END PGP SIGNATURE----- ```
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## Re: print("-5.3e - 10"*"2") doesnt work :/

 In reply to this post by Zachary P. Landau-4 ```And is there a way how to calculate fe. such string "(5+1+4)^(3+4)/5" so I dont need to change it into "5"+"1"..... The problem is that I get the formulas in string form... and I dont want to add " " all the time manualy Oldrich Svec ______________________________________________________________ > Od: [hidden email] > Komu: "Lua list" <[hidden email]> > CC: > Datum: 27.04.2006 23:43 > Předmět: Re: print("-5.3e - 10"*"2") doesnt work :/ > > On 4/27/06, Oldrich Svec <[hidden email]>wrote: > > Here (http://www.lua.org/pil/2.4.html) you can find an example of using > > strings (print("-5.3e - 10"*"2")) but it doesn't work(attempt to perform > > arithmetic on a string value)... I use Lua 5.1. > > Generaly I want to use it to calculate strings (fe. "5+1+4" => > > print("5+1+4"+"0") should give 10 but it doesnt work.. :( > > In this case, "-5.3e - 10" isn't recognized as a number. Try > "-5.3e-10"*"2", which is recognized as a number. > > "5+1+4"+"0" doesn't work because "5+1+4" is not a number. You would > have to do print("5"+"1"+"4"+"0") instead. > > -- > Zachary P. Landau <[hidden email]> > ```
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## Re: print("-5.3e - 10"*"2") doesnt work :/

 In reply to this post by Javier Guerra Giraldez ```Hups. I overlooked your answer.. I will try it.. hopefully it will work ;) Thanks for help Oldrich Svec ______________________________________________________________ > Od: [hidden email] > Komu: Lua list <[hidden email]> > CC: > Datum: 27.04.2006 23:30 > Předmět: Re: print("-5.3e - 10"*"2") doesnt work :/ > > On Thursday 27 April 2006 3:15 pm, Oldrich Svec wrote: > > Here (http://www.lua.org/pil/2.4.html) you can find an example of using > > strings (print("-5.3e - 10"*"2")) but it doesn't work(attempt to perform > > if this is scientific notation (-5.3 x 10^-10), remove the spaces around > the > '-' and it works ok. > > > arithmetic on a string value)... I use Lua 5.1. > > Generaly I want to use it to calculate strings (fe. "5+1+4" => > > print("5+1+4"+"0") should give 10 but it doesnt work.. :( > > use: > > function calcstring (s) > local f = loadstring ("return "..s) > return f and f() > end > > print (calcstring ("5+1+4")) => 10 > > > -- > Javier > > ```
 In reply to this post by David Given ``` On Apr 28, 2006, at 00:04, David Given wrote: ``````Zachary P. Landau wrote: [...] ``````In this case, "-5.3e - 10" isn't recognized as a number. Try "-5.3e-10"*"2", which is recognized as a number. `````` ```True, but those spaces are actually in the documentation, which makes the ```provided example not work --- a typesetting issue? `````` The spaces are in the White PIL, but it has been fixed in the Blue PIL. drj ```
 In reply to this post by Oldrich Svec ```Yes, try dostring(), just remember to prefix the formula with "return ". //Andreas Oldřich Švec skrev: ``````And is there a way how to calculate fe. such string "(5+1+4)^(3+4)/5" so I dont need to change it into "5"+"1"..... The problem is that I get the formulas in string form... and I dont want to add " " all the time manualy Oldrich Svec ______________________________________________________________ ``` ```Od: [hidden email] Komu: "Lua list" <[hidden email]> ```CC: Datum: 27.04.2006 23:43 ```Předmět: Re: print("-5.3e - 10"*"2") doesnt work :/ On 4/27/06, Oldrich Svec <[hidden email]>wrote: ``` ```Here (http://www.lua.org/pil/2.4.html) you can find an example of using strings (print("-5.3e - 10"*"2")) but it doesn't work(attempt to perform arithmetic on a string value)... I use Lua 5.1. Generaly I want to use it to calculate strings (fe. "5+1+4" => print("5+1+4"+"0") should give 10 but it doesnt work.. :( ``` ```In this case, "-5.3e - 10" isn't recognized as a number. Try "-5.3e-10"*"2", which is recognized as a number. "5+1+4"+"0" doesn't work because "5+1+4" is not a number. You would have to do print("5"+"1"+"4"+"0") instead. -- Zachary P. Landau <[hidden email]> ``` ``` ``` ``` ```