This contains the complete standard of FORTRAN 77. It is addressed to beginners as well as to advanced programmers: Because of a detailed presentation of FORTRAN, numerous examples, exercises, and a highly-structured presentation of the text, it can be used both as a textbook and as a reference book. In addition, structured programming with FORTRAN 77 is taught. Thus the reader learns to write well-structured FORTRAN-programs which are less complex and more reliable.