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#!F-adobe-helvetica-medium-r-normal--18*
#!N 
#!CSeaGreen  #!Rall553 Function Execution #!N #!EC #!N 
#!N When either a macro or a module function is executed, 
a new dynamically scoped environment specific to that function call is 
created. Variables that correspond to the function's input and output formal 
parameters are created in this new environment. The variables corresponding to 
the output formal parameters are initialized to  #!F-adobe-times-bold-r-normal--18*   NULL #!EF . 
Those variables corresponding to the input formal parameters are initialized in 
the manner described in the preceding section. If an input and 
an output formal parameter both have the same name, then they 
share a single parameter and are initialized to the value passed 
as input when the function is called. #!N #!N #!N #!N 
#!N  #!F-adobe-times-medium-i-normal--18*   Next Topic #!EF #!N #!N  #!Lall554,dxall555 h Macro Expansion  #!EL  #!N  #!F-adobe-times-medium-i-normal--18*   #!N