This comprehensive text on switching theory and logic design is designed for undergraduate students of electronics and communication engineering, electrical and electronics engineering, electronics and instrumentation engineering, telecommunication engineering, computer science and engineering, and information technology. It will also be useful to AMIE, IETE and diploma students. Written in a student-friendly style, and now in its second edition, this textbook provides in-depth coverage of switching theory and the design techniques of digital circuits. Striking a balance between theory and practice, it covers topics ranging from number systems, binary codes, logic gates and Boolean algebra, to minimization using K-maps and tabular method, design of combinational logic circuits, synchronous and asynchronous sequential circuits, and algorithmic state machines. It also discusses threshold gates and programmable logic devices (PLDs), and explores flip-flops and shift registers. Each chapter includes fully worked-out examples to provide a thorough grounding in related design concepts. Short questions with answers, review questions, fill in the blanks, multiple choice questions and problems are provided at the end of each chapter. New to this edition: VHDL programmes at the end of each chapter. Complete answers with figures. Several new problems with answers.