Convert C code to VBA

I am designing digital filters using a program called WinFilter. ([login to view URL]). This program provides output in C and VHDL code. For my purposes, I see two ways to do this: 1) The simplest is to only translate the attached C code to VBA and provide an Excel worksheet that can run this code on a data set. 2) Since this program can output various types of FIR and IIR lowpass, highpass, bandpass, etc. using the forms of Butterworth, Chebychev, and Bessel, I would prefer that the VBA be more adaptable and accommodate the various filter type outputs. In general, for given type of filter, the calculation in C is the same, but will change with the number of coefficients based on filter order for an IIR filter or number of taps for a FIR filter. What I would like is: - Open the output .c file after running Calculate Filter in Winfilter and saving the C code. - Excel VBA to match the output C code in the output file for the particular filter configuration - VBA code would operate on a data set, i.e., (x,y) data on a worksheet sheet within the Excel workbook. Before the VBA code is implemented across the possible filter types and configurations possible within Winfilter, I would like to set a milestone that one VBA translation is made to confirm that the C code is implemented correctly and the translated VBA code correctly process the input data. Also, if anyone has another way to do what I need from within Excel and not using Winfilter, I will also entertain that as an option. The C code is not very complicated. Several representative files are attached. Please let me know if you have any suggestions. Thanks, Art