If you know Fortran (any version) and are an avid programmer, this is a very good old book.It is a good reference guide whenever you want to know what does a specific function, or what difference there are with Fortran, Pascal or Ada.It is difficult to find a book that helps programmers to migrate from some languages to others. I found this book in the library of the institution where I do research, and I liked it so much that I ended up buying it.The 1995 version has an introduction to C++, so maybe I'll have a look on that in the future.So far my only critique is that it does not talks about complex numbers (variables). However I understand that, as C wasn't meant to handle complex numbers, however shortly after this book came, a new library was introduced to C that could do that.