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c++.command-line - Inputting comma-delimited data

I am writing a command-line C program to perform cubic-pline interpolation on
large data files.  Each line of the ASCII files will have: x-value,y-value.  The
values will be converted to long doubles via _atold and then put into separate
x-arrays and y-arrays.

I can probably eventually write code to properly input the data, but I am hoping
someone already has a solid routine for doing it.

Thanks in advance for your help.

Jan 29 2006