This is not a textbook. It is a reference book filled with good, usable subroutines written in Level II BASIC for TRS-80 Model I/III Microcomputers. Since Level II BASIC is a dialect of Microsoft BASIC, these subroutines were easily converted for use with QBasic and QuickBASIC on IBM PCs and compatibles.

The first two chapters are a tutorial on how to incorporate subroutines into larger programs.

Chapters 3-11 contain 36 subroutines, each annotated in a four-page spread that uses a fixed format: subroutine name, bibliographical reference, subroutine listing, variables, notes, calling program listing, and sample run.

Chapters 12-16 consists of 5 mother programs, each using several of the subroutines found in Chapters 3-11: annotated calendar, binary addition drill and practice, tea selection, linear interpolation, and monthly sales data report.

Without being theoretical, this book shows by example how to do modular, structured programming in line-numbered BASIC.

I especially liked the chapters on date calculations, statistics, and plotting. Several of these subroutines use algorithms that still find their way into my programs twenty-five years after this book was written. ( )