78. The following SAS program is submitted:
%macro print(dsn = sashelp.class, var1, var2 = name);
proc print data = &dsn;
var &var1 &var2;
run;
%mend;
%print(dsn = sashelp.prdsale, age name, var2 =height)
What is the result?
A.The value of the macro variable VAR1 is age.
B.The value of the macro variable VAR1 is null.
C.The value of the macro variable VAR1 is age name.
D.The macro variable VAR1 has no value; the macro failed to compile.
Answer: D
为什么选D，先谢谢了~~