HP Intelligent Management Center Standard Software Platform - Manual (Page 556)

Formula components
Creating a formula in Crystal Reports is like creating one in any spreadsheet
application. You can use any of the following components in your formula:
Fields
Example: {customer.CUSTOMER LAST NAME}, {customer.LAST YEAR'S
SALES}
Numbers
Example: 1, 2, 3.1416
Text
Example: "Quantity", ":", "your text"
Operators
Example: + (add), / (divide), -x (negate)
Operators are actions you can use in your formulas.
Functions
Example: Round (x), Trim (x)
Functions perform calculations such as average, sum, and count. All functions
available are listed with their arguments and are arranged by their use.
Custom functions
Example: cdFirstDayofMonth, cdStatutoryHolidays
Custom functions provide a way to share and reuse formula logic. They can
be stored in the BusinessObjects Enterprise Repository and then added to
a report. Once in the report, custom functions can be used in the Formula
Expert when creating formulas.
556 Crystal Reports 2008 SP3 User's Guide
Using Formulas 22
Formula components and syntax