User Guide : Scripting : Writing Expressions : Literal Values in Expressions
 
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Literal Values in Expressions
Literal values (constants) are exact values (alphabetic or numeric). These values are also the constants that you use in expressions, such as the numeric value 100, or the string "John Smith".
You must enclose only string literals within quotes. Numbers must not be enclosed in quotes (if enclosed in quotes, they will be strings, not numeric values).
See Also
Script Operators
Using Scripts to Perform Specific Tasks