What term refers to values that do not change and are often defined for reuse in code?

• A. Variable
• B. Constant
• C. Parameter
• D. Attribute

Answer: (B)

Values that stay the same across the program are constants. A constant is defined once and reused wherever needed, and it isn’t allowed to be changed later, which helps keep behavior predictable. This makes constants ideal for values like mathematical constants (pi), configuration limits, or other numbers and strings that should remain fixed throughout execution. By using a named constant, you avoid sprinkling the same literal value in many places, making the code easier to read and update if the value needs to change.

A variable, by contrast, can be reassigned and changed as the program runs. A parameter is a value passed into a function, serving as input rather than a fixed value. An attribute is a property of an object, describing its state. The concept described here—unchanging values defined for reuse—best matches the idea of a constant.