Define a format and associate it with your variables. You only need to specify the 'special' values, other values will adopt the default format.
proc format;
value ns
0 = "ns";
run;
data test;
array x{5};
do i = -5 to -1;
do j = 1 to 5;
x{j} = i + j;
end;
output;
end;
format x1-x5 ns.;
drop i j;
run;
proc print data=test noobs; run;
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