10x Blogs Directory

Monday, February 23, 2009

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;