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#!N
#!CSeaGreen #!N #!Rall533 Assignment
Statements #!N #!EC Assignment statements store values in variables. The general
form of an assignment statement is: #!N #!N #!CForestGreen #!N #!F-adobe-courier-bold-r-normal--18*
#!N #!F-adobe-times-bold-i-normal--18* left-side #!EF [attribute_name:value,...] = #!N #!F-adobe-times-bold-i-normal--18* right-side #!EF [attribute_name:value,...]
#!EF #!N #!N #!EC #!N #!N The #!F-adobe-times-bold-i-normal--18* left-side #!EF portion
of an assignment statement is a sequence of one or more
identifiers separated by commas. The [attribute_name:value,...] value pair lists and the
brackets are optional, and are discussed in #!Lfca,dxall543 h Function Call Attributes #!EL . The equal
sign ( #!F-adobe-times-bold-r-normal--18* = #!EF ) is the assignment operator. It
stores the values specified in the #!F-adobe-times-bold-i-normal--18* right-side #!EF portion of
the statement in the variables named by the identifiers specified in
the #!F-adobe-times-bold-i-normal--18* left-side #!EF portion of the statement. You can specify
the values in the #!F-adobe-times-bold-i-normal--18* right-side #!EF portion of the statement
as a sequence of expressions or as the result of a
single function call. #!N #!N You can also use either of
two additional symbols, #!F-adobe-times-bold-r-normal--18* <- #!EF or #!F-adobe-times-bold-r-normal--18* := #!EF ,
as the assignment operator. An assignment statement is terminated with a
semicolon, indicating the end of the #!F-adobe-times-bold-i-normal--18* right-side #!EF portion of
the statement. #!N #!N The values specified to the right of
the assignment operator are assigned to the identifiers to the left
of the assignment operator. If the number of values equals the
number of identifiers, the first value is stored in the first
identifier, the second in the second, the third in the third,
and so on. If the number of values is greater than
the number of identifiers, the extra rightmost values are ignored. If
the number of values is less than the number of identifiers,
the values are assigned in order to the leftmost identifiers. #!N
#!N Those identifiers not receiving a value from the #!F-adobe-times-bold-i-normal--18* right-side
#!EF list are set to the value #!F-adobe-times-bold-r-normal--18* NULL #!EF .
In addition, if an identifier is repeated in the #!F-adobe-times-bold-i-normal--18* left-side
#!EF list, then the #!F-adobe-times-bold-i-normal--18* right-side #!EF associated with that identifier
is the value associated with its rightmost instance. #!N #!N All
identifiers that have not had a value explicitly assigned to them
have the value #!F-adobe-times-bold-r-normal--18* NULL #!EF . #!N #!N #!N #!N
#!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N #!N #!Lall534,dxall535 h Expression Assignments #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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