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piccer
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? operator
PostPosted: Sat Jan 10, 2004 4:48 pm     Reply with quote
with the fragment below I get the error

expecting :

d=d*(.25);
d==0 ? f="%05.0f" : f="%5.0f";
sprintf(s1,f,d);

I'm trying to print this value if it is zero. and with no leading zeros if d is greater than zero.

thanks
Ttelmah
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Re: ? operator
PostPosted: Sun Jan 11, 2004 5:41 am     Reply with quote
piccer wrote:
with the fragment below I get the error

expecting :

d=d*(.25);
d==0 ? f="%05.0f" : f="%5.0f";
sprintf(s1,f,d);

I'm trying to print this value if it is zero. and with no leading zeros if d is greater than zero.

thanks

There are two problems here.
The first 'problem' here is a little fundamental to the CCS C. You cannot have a pointer to a constant array in ROM. The string definitions, are actually constant arrays. Hence to do this, you would need to have a storage area in RAM defined, large enough to hold the strings, with 'f' pointing to this, and then use the strcpy function to copy the constant strings into this area.
The second, is that the 'conditional expression' (?Smile syntax, is designed to 'return' the value evaluated. So, in normal C, the syntax would be:

f = (d==0 )? "%05.0f" : "%5.0f";

Unfortunately, the first problem prevents this being used.

Best Wishes
Guest
PostPosted: Sun Jan 11, 2004 7:16 am     Reply with quote
thanks. i figured it out. when all else fails read the manual.

i worked around it by using

d==0 ? sprintf(s1,"format",d):sprintf(s1,"format",d);
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