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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | #!F-adobe-helvetica-medium-r-normal--18*
#!N
#!CDarkGreen
#!N #!Rvalsv Variables as Left-Side Values #!N #!EC #!N #!N All
assignments in a macro's environment affect variables that are local to
the macro. These variables, if they do not already exist, are
created in the macro's environment when they are first used on
the left-hand side of an assignment expression. Thus, a variable outside
of a macro cannot be modified with that macro. #!N #!N
The only way to make such a change is to propagate
a new value out of the macro using its output formal
parameters, and to use this returned value in an assignment statement
in the enclosing environment. #!N #!N Given these semantics, it is
possible for a local version of a variable to come into
existence and obscure a more global version of a variable, midway
through a macro's execution. #!N #!N #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next
Topic #!EF #!N #!N #!Lvarsv,dxall558 h Variables as Right-Side Values #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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