ColdFusion expressions consist of operands and operators. Operands are constants and variables, such as "Hello" or MyVariable. Operators, such as the string concatenation operator (&) or the division operator (\/) are the verbs that act on the operands. ColdFusion functions also act as operators. 
The simplest expression consists of a single operand with no operators. Complex expressions consist of multiple operands and operators. For example, the following statements are all ColdFusion expressions:

(1 + 1)/2 
"father" & "Mother" 

For detailed information on using variables, see Using ColdFusion Variables. For detailed information on expressions and operators, see Using Expressions and Number Signs.

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