To compile the code, type make. You should get two executables:
"interpolation" and "spline".

The first example demonstrates the log-tan mesh and error of linear interpolation
of a function exp(-x)/sqrt(x)

The second example implements cubic splines and the help can be acceded by typing
"spline --help"

By default, "spline" prints the error of cubic spline for the same function

If '-task 1' option is added, it shows Fourier transform of the same function
using splines.