Friday - Test 3
  Chapter 4, 6
  
  ASCII (character encoding)
  American Standard Code for Information 
    Interchange
    
 Letters,
 Digits,
 Symbols,
 Control Information
 
 http://www.asciitable.com/
 
 A is hex 41: 0100 0001
 a is hex 61: 0110 0001
 
 W = (2 + Y) * X