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module ff_beh_pos(s,r,clk,q,qbar);
input s,r,clk;
output reg q,qbar;
always @(posedge clk)
begin
if(s==1 & r==0)
begin
q<=1;
qbar<=0;
end
else if (s==0 & r==1)
begin
q<=0;
qbar=1;
end
else if(s==0 & r==0)
begin
q<= q;
qbar <= qbar;
end
else 
begin
q<=0;
qbar<=1;
end
end
endmodule