Something Not So Right About Google Calculator

Apparently one quadrillion is too much for Google’s calculator. Beside 999999999999997, you get the same 0 result if you minus with 999999999999998.

Well if you add a ‘1′ digit in front of the number, you get the 0 result early, starting from 1999999999999994:

1999999999999999 - 1999999999999994 = 0

1999999999999999 - 1999999999999995 = 0

1999999999999999 - 1999999999999996 = 0

1999999999999999 - 1999999999999997 = 0

1999999999999999 - 1999999999999998 = 0

If you increase the number further, you get the 0 result earlier further:

2999999999999999 - 2999999999999991 = 0

2999999999999999 - 2999999999999992 = 0

2999999999999999 - 2999999999999993 = 0

2999999999999999 - 2999999999999994 = 0

2999999999999999 - 2999999999999995 = 0

2999999999999999 - 2999999999999996 = 0

2999999999999999 - 2999999999999997 = 0

2999999999999999 - 2999999999999998 = 0

For ‘3 series’, the 0 result starts with 3999999999999988 and for ‘4 series’ it is 4999999999999985.

Interesting if someone could reveal the algorithm used for this faulty calculator. Hope Google can correct it asap.