The purpose of this book is to teach you how to use C++ and the object-oriented programming style to produce better-quality programs, with an emphasis on scientific and engineering programs. Most such programs today are written in FORTRAN or C and without the benefit of any particular programming methodology. For small programs of strictly numerical content, FORTRAN or C may be adequate. However, larger programs and programs containing nonnumerical code are too expensive to understand, to revise, and to improve if written in FORTRAN or C. We present object-oriented programming as a design and programming style that addresses these problems and C++ as a programming language designed to allow efficient use of the object-oriented style. If you are still using FORTRAN or C in your programming, we invite you to explore a new world, the world of object-oriented programming in C++. Audience.