PREFACE

PREFACE Human civilization achieved the highest peak with the development of computer known as “Computer era”. Literate are those who have the knowledge in using the computerwhereas others are considered illiterate inspite of the other degrees obtained. The growth of the nation at present lies in the hands of the youth, hence the content of this book is prepared in such a way so as to attain utmost knowledge considering the future needs of the youth. iii version version - - - - iv