Chp 2 Types, Operators, and Expressions

• Variables and constants are basic data objects manipulated in a program.
• Declarations list the variables to be used, and state what types and initial values if any
• Operators specify what is to be done to the data objects
• The type of an object determine its set of values and what operations to be performed  
• 2.1 Variable Names
• Names are made up of letters and digits; first character must be a letter
• Underscore "_" counts as a letter
• Upper and lower case letters are distinct
• Traditional C practice is to use lower case for variable name and all upper case for symbolic constants