Variable Roles

Stores a value that will not change over the course of the entire program

• Fixed Value Variable

• Most Recent

• Walker

• Best So Far

Stores user input or stores information about a program's state that changes unpredictably.

• One-way flag

• Aggregator

• Most Recent

• Accumulator

Maintains a running total.

• Best-So-Far

• Walker

• Accumulator

• Fixed Value

Stores a list of values built up over time and remembers separate individual values.

• Fixed Value

• Walker

• Best - so - far

• Aggregator

A variable that counts in an arithmetic sequence, usually counting by ones starting at 0 or 1.

• Stepper

• Walker

• One-way flag

• Aggregator

Stores one item from a list at a time during iteration.

• Walker

• best-so-far

• One-way flag

• Accumulator

Keeps track of a record best or worst and updates when a new record best or worst has been reached.

• Aggregator

• One-Way Flag

• Stepper

• Best-so-far

Stores whether a condition has been true yet; reset before iteration and possibly raised during iteration.

• Accumulator

• One-Way Flag

• Aggregator

• Stepper