Character array to long?

davidbue · Joined: 05 Nov 2007 Posts: 28 Location: Denmark

Hi everybody.

I've got a little problem. Through hyperterminal the user must be able to type in a number which then is used as setpoint for a PID algorithm.

The number can be anything between 1-1000

My code right now looks like this:

char string[10];
long frequency;

... lots of irrelevant code ...

gets(string);

Now! Let's assume the user typed 978. How do I convert the character array to a long? Should I maybe use an all different approach?

Thank you for your help!

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Consider that for common problems like this, the C language will
already have a solution -- it's the series of functions known as
"atoi" (ASCII to Integer). In this case, you want a 16-bit result,
so use the version of it called "atol" (ASCII to long). It's in the
CCS manual.

davidbue · Joined: 05 Nov 2007 Posts: 28 Location: Denmark

Hi PCM programmer!

I'm so sorry. I forgot to say... I'd like to not use the atoil() as the stdlib.h eats up waaay to much memory when included. :-D

I'm looking for an alternative way to capture the number.

Sorry for the missing information, and thank you so much for your answer.

Best regards
David

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

You can use a truncated version of it. See the adtol (ASCII Decimal
to Long) function in this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=17563&highlight=adtol