macro with Scan funct

[Sonal Dongre]

The following prog code runs fine but when i write it into a macro its giving me an error :

(Prog code)

data macm;

i=1;

do while((scan("&dsnames",i))^= "");

dsname= scan("&dsnames",i);

i=(i+1);

output;

end;

run;

pog code converted in to a macro.

options mprint symbolgen mlogic;

%macro loop;

%let i= 1;

%do %while ((%scan("&dsnames", &i))^= "");

%let dsname = %scan("&dsnames", &i);

%let i =%eval( &i + 1);

%output;

%end;

%mend;

%loop;

Errors received are -

MLOGIC(LOOP):  Beginning execution.

MLOGIC(LOOP):  %LET (variable name is I)

SYMBOLGEN:  Macro variable DSNAMES resolves to ADAE,ADEF,ADLB,ADSL,ADTTE,ADXP

SYMBOLGEN:  Macro variable I resolves to 1

ERROR: A character operand was found in the %EVAL function or %IF condition where a numeric operand is required. The condition was: (%scan("&dsnames", &i))^= "" 

ERROR: The condition in the %DO %WHILE loop, (%scan("&dsnames", &i))^= "", yielded an invalid or missing value, .  The macro will stop executing.

ERROR: The macro LOOP will stop executing.

MLOGIC(LOOP):  Ending execution.

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