Constrained Random Stimulus-$urandom

In reply to sunny:

if i have 32 bit two reg where i have generate arithmetic addition overflow i.e carry should be generated. i m using
reg [0:31] A;
reg [0:31] B;

A = $urandom_range(8’hF0000000, 8’hFFFFFFFF);
B = $urandom_range(8’hF0000000, 8’hFFFFFFFF);
but its not wrking somehow… can you please help