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#!F-adobe-helvetica-medium-r-normal--18*
#!N 
#!CDarkGreen #!N  #!Rall558 Example #!N #!EC 
#!N #!N The following is a sample script that illustrates how 
variables are treated in macros: #!CForestGreen #!N #!N  #!F-adobe-courier-bold-r-normal--18*   #!N // 
This is a complete sample script #!N #!N macro add(a, b) 
-> (sum) #!N { #!N c = a + b; // 
c is created and given the value a+b #!N c = 
a + x; // x is found in the top level, 
and used in this expression #!N c = a + z; 
// z does not exist anywhere; NULL is used #!N sum 
= a + b; // sum is created local to the 
macro, separate from the #!N // version of sum in the 
top level #!N } #!N #!N x = 7; #!N sum 
= 10; #!N total = add(4, 4); // total = 8, 
sum stays at 10 #!EF #!N #!N #!EC #!N #!N #!N 
 #!F-adobe-times-medium-i-normal--18*   Next Topic #!EF #!N #!N  #!Lall559,dxall560 h Assignment and Function Call Semantics  #!EL  #!N  #!F-adobe-times-medium-i-normal--18*   #!N