char* to float? - GameCreators Forum

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kklouzal

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Joined: 15th May 2009

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Posted: 18th Mar 2010 22:38

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Every time I think 'char* to float' I then think 'impossible' every time, I have a char* variable which holds a float value "1.5" I've tried to typecast it to a float but the compiler just tells me im dumb.. it typecasts to int but then the actual value of the int is hardly close to what it should be, am I out of luck here?

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Cetobasilius

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Posted: 18th Mar 2010 22:41 Edited at: 18th Mar 2010 22:45

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i had the same problem but i had a workaround... multiply your value x100 before it is a char ( if you have it in a text file just use 100 instead of 1.0f, or 150 for 1.5f, 90 for 0.9f ) then use atoi, and divide it by 100 in your game, the result will be 1.5f

hi

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dark coder

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Posted: 18th Mar 2010 22:51

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http://www.cplusplus.com/reference/clibrary/cstdlib/atof/

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kklouzal

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Posted: 18th Mar 2010 23:02 Edited at: 18th Mar 2010 23:03

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Thanks for the prompt response!

I have just one problem, the value's can not be multiplied by 100x before it is a char, they are being entered into a textbox so they are already a float off the bat..

EDIT: atof says it is for a double? Can I just use it like it is a float?

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Benjamin

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Posted: 18th Mar 2010 23:29

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Quote: "EDIT: atof says it is for a double? Can I just use it like it is a float?"

Yes.

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entomophobiac

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Posted: 19th Mar 2010 09:45

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I'd suggest one of two solutions:

Create a string class with the type of functionality you need, using a char* as its core.

OR

Use the STL string class. (I.e., #include <string>

.

C-style strings are more hassle than they're worth, in my opinion. Then again: if you're throwing a lot of text around, maybe it's a performance decision.

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