printf() problem displaying float value without decimal plac

webbone · Joined: 20 Sep 2004 Posts: 14 Location: Sacramento, CA

I am trying to get printf() to output a 2 digit display value from a float value and have not had success thus far getting it to behave. The float variable has a value between 0 and 70 and I only want to display ' 0', '70', '35' and similar such concepts.

Normally I would use something like this if I wanted ' 0.1', '70.0', '35.4':

Ttelmah · Guest

%3.0f, should have given the required effect. There do seem to be some compiler 'issues', with the way the conversion arithmetic is done, leading to tiny errors, but I have just tried it, and %3.0f, for a float 'val', counting from 1 to 10, gives 1,2,3,4,5,6,7,8,9,10 on 3.221.
There is though a leading space, since this is the default for numbers. It may be that you need the %-3.0f format, which moves the numbers tight to the left of the output field, rather than giving this space, which unfortunately, CCS don't support in their version of printf...
You can simulate the effect, by using sprintf to a string buffer, and then printf to output the result from one character right. So:

int8 b[6];
sprintf(b,"%3.0f",val);
printf("%s",b+1);

Best Wishes