%macro test(x);
data temp;
set temp1;
y=5;
y = y + &x.;
run;
%mend;
%test(5);
will y be equal to 10?
%macro test(x);
data temp;
y=5;
y = y + &x.;
run;
%mend;
%test(5);
Yes it will be 10, check this code.
You may be looking for SYMGET as well if the application is more complex then your example.
Yes. For every observation read from TEMP1 and written to TEMP will have Y=10.
You can try it without the macro wrapper by just using %LET to set the value of the macro variable X.
%let x=5;
data temp;
set sashelp.class ;
y=5 + &x ;
put (name y) (=);
run;
Name=Alfred y=10
Name=Alice y=10
Name=Barbara y=10
Name=Carol y=10
Name=Henry y=10
Name=James y=10
Name=Jane y=10
Name=Janet y=10
Name=Jeffrey y=10
Name=John y=10
Name=Joyce y=10
Name=Judy y=10
Name=Louise y=10
Name=Mary y=10
Name=Philip y=10
Name=Robert y=10
Name=Ronald y=10
Name=Thomas y=10
Name=William y=10
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