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Strings

 
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rfjhh



Joined: 31 Mar 2011
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Strings
PostPosted: Thu Mar 31, 2011 6:15 pm     Reply with quote

In PIC C, how can I use string type variables?
In c# I can define
string a;

.
.
.
a = "example";
.
.
.
PCM programmer



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PostPosted: Thu Mar 31, 2011 7:09 pm     Reply with quote

The short answer is, you have to declare an array to hold the string.

http://cplus.about.com/od/learningc/ss/strings.htm
bkamen



Joined: 07 Jan 2004
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Re: Strings
PostPosted: Thu Mar 31, 2011 9:28 pm     Reply with quote

rfjhh wrote:
In PIC C, how can I use string type variables?
In c# I can define
string a;

.
.
.
a = "example";
.
.
.


I would also strongly recommend getting "The C Programming Language" by Kernighan & Ritchie

-Ben
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eliasS



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PostPosted: Thu May 05, 2011 11:35 am     Reply with quote

In the old C a string basically is an array of chars, if you want to declare a string variable you don't use string="dummy"; instead you use a char array and you can't initialize it like this char myString="dummy"; This will create an array of chars of 6 elements 'd' will be at this location myString[0] and 'y' in myString[5]
Ttelmah



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PostPosted: Thu May 05, 2011 2:55 pm     Reply with quote

99% right. The 'y' is at myString[4]. myString[5] contains the 'null terminator' '\0' character.
This is the only thing 'special' about strings. In C, a string is 'a null terminated array of characters. So a 5 character string, needs 6 characters of storage, the extra one for the terminator character.
Remember also, that since a 'string' is not a type in C, it has to be explicitly copied, either 'character by character', by looping through the array, or by using the string functions (which do this for you).

Best Wishes
rfjhh



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Thanks
PostPosted: Thu May 05, 2011 7:12 pm     Reply with quote

I've got the answer... thank you
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