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Computer science · University

Values, variables and expressions

A concrete piece of data such as a number or string.

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Prerequisites

Basic computer literacy.

Study notes

Value

A concrete piece of data such as a number or string.

Variable

A name that refers to a value in a program.

Expression

Code that evaluates to a value.

Type

A category that determines operations and representation for a value.

Worked examples

Which term best matches this description: A concrete piece of data such as a number or string.

Value is the matching concept in this lesson.

Value

Which term best matches this description: A name that refers to a value in a program.

Variable is the matching concept in this lesson.

Variable

Check your understanding

  1. Which concept would you apply first in a situation where code that evaluates to a value.

    1. Expression
    2. Variable
    3. Value
    4. Type

  2. Name the concept described as: A category that determines operations and representation for a value.

  3. Which statement about Value is most accurate?

    1. Code that evaluates to a value.
    2. A concrete piece of data such as a number or string.
    3. A name that refers to a value in a program.
    4. A category that determines operations and representation for a value.

  4. Explain one important difference between Value and Variable.

Answers and marking guidance

Answers and marking notes
  1. Expression

    The scenario directly calls for Expression.

  2. Type

    The intended concept is Type.

  3. A concrete piece of data such as a number or string.

    The definition in the lesson notes gives the required condition.

  4. Value: A concrete piece of data such as a number or string. Variable: A name that refers to a value in a program.

    Credit a clear distinction using both definitions and an appropriate example if supplied.

Further reading and review references

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