Answer Posted / ashish

data a;
input num;
cards;
1
2
3
-5
-7
-8
9
10
0
-56
-3
;
run;
data b ;
retain sum_n sum_p;
set a end=last;

if _n_=1 then sum_n = 0;
if _n_=1 then sum_p = 0;
if(num<0) then sum_n= sum(sum_n,num);
else sum_p= sum(sum_p,num);
if last then output;
run;

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