The College of Saint Rose CSC 202 Introduction to Programming David Goldschmidt, Ph.D. Hardware consists of five key subsystems: from Fluency with Information Technology, 4th edition by Lawrence Snyder, Addison-Wesley, 2010, ISBN Each instruction goes through this cycle: from Fluency with Information Technology, 4th edition by Lawrence Snyder, Addison-Wesley, 2010, ISBN We use ten symbols to count Digits: Computers use two symbols to count Digits: 0 1 (why?) What is the exact mechanism for counting? How do we count from 1 to 20? The powers of 2 give us the decimal weights Convert from binary to decimal: in decimal is = 153 What about negative numbers? powers of decimal weights binary digits Use twos complement representation for negative numbers Convert from binary to decimal: in decimal is = -103 powers of decimal weights binary digits Hexadecimal is base 16 It uses 16 digits: A B C D E F Why use hex? Binary numbers are too long Whats 2BAD in decimal? decimalbinaryhexadecimal A B C D E F Represent printable and special characters What about Unicode? from Fluency with Information Technology, 4th edition by Lawrence Snyder, Addison-Wesley, 2010, ISBN