Hudson Valley Community College CISS-110 – Programming & Logic I 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 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  What’s 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

public static void main( String[] args ) { float x; System.out. println( "... Java source code 7A F FE F D 4E intermediate code (byte code) translation program (compiler) virtual machine (JVM) A F AB AE F DA 44 intermediate code of precompiled libraries (java.util.Scanner byte code) program execution

 Read and study Chapter 1  Get Textpad up and running  Do Project #1:  Given a 3-digit number:  Generate output that shows each digit: int num = 582; The number is 582 The hundreds column is 5 The tens column is 8 The ones column is 2