This book is designed to meet the syllabus requirements of the students of B.Sc. (H) (Math/Computer Sc./Physcial Sc), B.C.A/M.C.A., B.Tech.(Computer Sc., E.C.E., I.T.,), M.Tech (C.S.E./ I.T.), M.Sc.(Mathematics/C.S./Electronics) and other professional courses of various universities/institutions at home and abroad. The students of open and distance education courses will find the book most useful.