How to write and debug large-scale software written in the FORTRAN 77 computer language. Provides engineers and scientists with the tools to create fast computer programs, and explains how to test and debug new or modified programs. Focuses on features important to development of major programs, such as subroutine arguments and dummy arguments, global and local variables, and formatted and unformatted input and output. Reviews the concept of machine code, along with the binary number system, fixed and floating point data representation on IBM, DEC VAX, and Cray computers, and ASCII and EBCDIC character codes. Programming style, portability, and debugging are stressed. Also introduces the advanced topics of structured analysis and structured design, and shows how to apply them to large-scale software engineering.