%let Mv=shoes;
%macro PRODUCT(Mv=bicycles);
%let Mv=clothes;
%mend;
%PRODUCT(Mv=tents)
%put Mv is &Mv;
Why is the value o MV is shoes?? Please explain
Because you have both global and local variables.
Since the macro is finished when you request a PUT it uses the global version - which is the first assignment.
Yeah. The local symbol table would be destroied after running the macro.
So you only get the global symbol value.
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