if you like old languages FORTRAN is a good one
its from the 1950's and the code is fairly easy to read and its similar to
BASIC
heres some resources:
to install a fortran compiler use
sudo apt-get install gfortran
and to use the compiler
gfortran program.f08
also some tutoirals
general fortran:
https://www.youtube.com/playlist?list=PLMYDnuotCSMXV0Yk6nJBQF4sqzI8GjfBj
how to mix fortran with c:
calling c from fortran:
http://92.19.232.58:82/videos/fortran_tutorials/html/ftrn_tut_11.html
calling fortran from c:
http://92.19.232.58:82/videos/fortran_tutorials/html/ftrn_tut_12.html