In new matlab use coder package

http://www.mathworks.co.uk/help/simulink/slref/coder.ceval.html

otherwise use mex.

http://www.mathworks.co.uk/help/matlab/matlab_external/standalone-example.html

Mex is better option if you have older version of Matlab else look for live webinars on mathworks website, you will find many live demonstrations as well.

You have something to do:

1- Writing the code in matlab and export the C version by matlab coder.

2- Writing the code in matlab and export a dll to be imported in C program by MCR.

3- Utilization of Corba technique if you are a profi in programming.

good luck

1)writing a mex file would suffice.

2)If only outputs are required then save file in excel.The import data in matlab.