The book provides an introduction to computer aided engineering. The source programs are compiled in the above four languages to illustrate the problem examples. The problems analyzed relate to matrix algebra and solution of matrix equations, to be exact, least squares, and spline curve-fits, roots of polynomial and transcendental equations, finite differences, interpolation and numerical differentiation, numerical integration of single and double integrals, numerical solution of ordinary and partial differential equations, eigenvalues and eigenvectors. Interacting operation is emphasized. In the introduction to each method an explanation of the procedures is given. Indices are added. The book may be used for self-study and for general references.