This is a book about the Computer System and Programming in ‘C’. If you are seeking a book to increase your typing speed, expand on your knowledge of word processing, or learn the secrets of chip fabrication and design, this is not the one for you. However, if you want to become thoroughly familiar with the C programming language and with fundamental knowledge, then you have made a wise choice. The book is in two sections one is for Fundamental Development of Computer Science and the second is thorough knowledge of ‘C’ language. It is one thing to read about a language; it is quite another to get involved in it. The best and most time effective way to absorb a language such as C is to have a terminal or computer available to you, preferable at your fingertips. You will be exposed to well over one hundred C programs in this book. You are encouraged to experiment with the programs illustrated in this text. Familiarity with the language will bring with it greater understanding; the more you understand about C, the more you will enjoy it. You might be surprised to find out that C has a rather extensive variety of operators and data types designed specially to offer you a greater range of options and to permit you to solve a multitude of problems with the minimum of effort. These may range in diversity from book keeping to accounting to problems of mathematics. There is no real limit to the areas in which C can be of use. The only limitation is your imagination. At the first opportunity, begin to write your own programs. This is an order! This book is intended for the person with or without programming experience. No programming experience will be assumed, however, nor will we expect the reader to have any mathematical expertise above the standard of high school level. The novice to programming will be naturally move along at a slower pace than that of the more experienced, simply because there is often much transfer of knowledge when going from one language to another. The experienced person has the distinct advantage of at least knowing what to expect. Such people can probably skim over much of the more descriptive detail without any loss. Even so, C may have some unexpected surprises for the seasoned programmer too. Whatever your background is, by the time you have finished reading this book, have answered the myriad of questions, and completed the suggested exercises, you will have come to know the essentials of the C language. That is the only purpose of this book. To help get you involved-probably the most important ingredient to the effective learning of any subject material—each chapter is followed by a list of questions based on the text, for which answers are supplied. Section-I contains all questions and answers as whole at the end of section and each chapter of Section-II contains related questions.