Witold Baryluk wrote: > Maybe i written not clearly. I was thinking more about such situation: > >> 0.111111111111 - 0.111111111113. > -1.9999973899231804e-12 > -0.000000000001999997389923180435 > > It have only one correct significant decimal digit. > You are quite right. I hadn't thought of that one. Richard.