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Assigning Values to Variables - Description
 
A variable is a name that refers to an object - a particular number,
string, or record. (A record is a variable declared to be of a user-defined
type.) Simple variables refer to a single number, string, or record. Array
variables refer to a group of objects, all of the same type. A numeric
variable, whether simple or array, can be assigned only a numeric value
(either integer, long integer, single precision, or double precision).
A string variable can be assigned only a character-string value. You can
assign one record variable to another only if both variables are the same
user-defined type. However, you can always assign individual elements of
a record to a variable of the corresponding type.
 
The variable must always match the type of data (numeric or string) assigned
to it.