module top;
real zero, mzero, inf, minf;
initial begin
zero = 0.0;
mzero = -1.0 * zero;
inf = 1/0.0;
minf = -1 * inf;
$display("+0=%f, -0=%f, inf=%f and minf=%f.", zero, mzero, inf, minf);
end
endmodule