This textbook has been written according to the new revised syllabus of AICTE which includes the syllabus of the Maulana Abul Kalam Azad University of Technology (Formerly WBUT) as well as other universities/institutes for the Second year (Forth semester for CSE & IT, 3rd semester for CE & MCA) students. It consists of fourteen chapters with various types of problems along with worked out examples which are essential to the Engineering /Technological students. This book can also be treated as a supplementary book for BE/B.Tech. Students of other universities/institutions.