I use scilab 5.2.2 and have a problem to find the zeros of bessel functions,Jo(x),J1(x)....

Bessel functions are build in functions in scilad.example:besselj(0,3) gives0,2600520

Can someone help me to compute these zeros of bessel functions in

scilab.If not a Fortran 95 program is also good.

Thank you

Kind regards