Variables

• A variable is an item of data used to store the state of objects.
• A variable has a:
  -data type
• The data type indicates the type of value that the variable can hold.
  -name
• The variable name must follow rules for identifiers.

Declaring Variables

• Declare a variable as follows:
  [=initial value];
• Note: Values enclosed in <> are required values, while those values in [] are optional.

Coding Guidelines

• It always good to initialize your variables as you declare them.
• Use descriptive names for your variables. Like for example, if you want to have a variable that contains a grade for a student, name it as, grade and not just some random letters you choose.
• Declare one variable per line of code. For example, the variable declarations,
  

double exam=0;

double quiz=10;

double grade = 0;
is preferred over the declaration,
double exam=0, quiz=10, grade=0;