FLOATING NULL?

[Karl Ihrig]

I am writing a data analysis program, my first big project in C,
or any language for that mater.  

I take an ascii data file from a spreadsheet, and put it into a
string.  Then from the string I put it all in a structure, which
has strings for the column names and a 2 dimensional float array
for the numerical data.  My problem is that there are blank
spots in my real world data.  I am totally baffled.  How do I
mark the float element of the array as null, blank, or not
available?

Karl Enrique Ihrig
karl at wiliki.eng.hawaii.edu