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Declaring Constants

The declaration of a constant corresponds to the declaration of a read-only variable. Constants can be used exactly like variables, except that they cannot be modified.

Constants are declared using the following syntax:

Define {Identifier} for {Token}

Where:

  • {Identifier} is the name assigned to the new constant.
  • {Token} is the token that the named constant will represent. You cannot use a DataFlex reserved word to name a constant. The token that you use can be any String, Number, or Date token.

Examples of Constant Declarations

Define C_PI          for 3.14156
Define C_MaxLines    for 100
Define C_CompanyName for "Data Access Corporation"

DataFlex naming convention suggests that you prefix your constant names with a "C_". This will help you to distinguish constants from variable names within your program.