Replacing missing value with another cells value

[Alexjaco1]

I would like to replace all missing values with another cells value for example...

Data Have

OBS	Var1	Var2
1	10	15
2	11	.
3	12	.

Data Want

OBS	Var1	Var2
1	10	15
2	11	11
3	12	12

[r_behata]

data have;
input Var1 Var2;
cards;
10 15
11 .
12 .
run;

data want;
set have;
 var2=coalesce(var2,var1);
run;