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problem with string

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ROBOTICAR

Joined: 28 Aug 2007
Posts: 45

problem with string
Posted: Sat Aug 09, 2008 5:12 am

Hi ALL How can I empty the string? for example I define J[40] and with serial communication (RS232) get 40 characters. I want to keep on this loop and I need to make J empty. How can I do that?

ROBOTICAR

Joined: 28 Aug 2007
Posts: 45


Posted: Sat Aug 09, 2008 10:55 am

and another question. How can I change 3256.212 into 3256212 ??

Guest

Posted: Sat Aug 09, 2008 7:44 pm

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Code:

memset(J, 0, 40);

you will need to include string.h to use memset.

You could also make a for loop

Code:

for(x=0;x<40;x++)
{
J[x] = 0;
}

As for your second question, you need to make sure that the variable storing the second number will be of a large enough type. An unsigned 32 bit integer will do the trick. Then just multiply by 100.

Guest

Posted: Sat Aug 09, 2008 7:45 pm

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Anonymous wrote:

Then just multiply by 100.

Sorry, I meant 1000

SherpaDoug

Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA

Re: problem with string

Posted: Sun Aug 10, 2008 5:03 am

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ROBOTICAR wrote:

Hi ALL
How can I empty the string? for example I define J[40] and with serial communication (RS232) get 40 characters. I want to keep on this loop and I need to make J empty. How can I do that?

First you must define "empty". In C strings are usually terminated with a null (0x00). So if you make the first byte of the string null the string will be empty. If this is a serial buffer with head and tail pointers you can make it empty by setting the two pointers to the same address.
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