In this book wedescribe the basic elements of present computational technologies that use the
algorithmic languages C C++. The emphasis is on GNU compilers and libraries FOSS for the
solution of computational mathematics problems and visualization of the obtained data. At the
beginning a brief introduction to C is given with emphasis on its easy use in scientific and
engineering computations.We describe the basic elements of the language such as variables
data types executable statements functions arrays pointers dynamic memory and file
management. After that we present some observations on the C++ programming language.We discuss
the issues of program compiling linking and debugging. A quick guide to Eclipse is also
presented in the book. The main features for editing compiling debugging and application
assembling are considered.As examples wesolve the standard problems of computational
mathematics: operations with vectors and matrices linear algebra problems solution of
nonlinear equations numerical differentiation and integration interpolation initial value
problems for ODEs and so on. Finally basic features ofcomputational technologies are
illustrated with model problems. All programs are implemented in C C++ with using the GSL
library. Gnuplot is employed to visualize the results of computations.
