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A constant is a fixed piece of data that exists only on the diagram. Use a constant instead of a control when you know that a certain piece of data should always be the same regardless of other parts of your code. LabVIEW provides the following kinds of constants:

  • Universal constant—Represents commonly used values that are always the same, such as pi (π), the speed of light, or the character that represents pressing the Enter key.
  • User-defined constant—Accepts user input. You define the values as you develop the code.