# The Google Calculator Glitch, could float vs. double be a possible reason?

Question :

The Google Calculator Glitch, could float vs. double be a possible reason?,

I did this Just for kicks (so, not exactly a question, i can see the downmodding happening already) but, in lieu of Google’s newfound to do  (check it! according to google 500,000,000,000,002 – 500,000,000,000,001 = 0), i figured i’d try the following in C to run a little theory.

``int main()  {     char* a = "399999999999999";     char* b = "399999999999998";       float da = atof(a);     float db = atof(b);       printf("%s - %s = %fn", a, b, da-db);       a = "500000000000002";     b = "500000000000001";     da = atof(a);     db = atof(b);     printf("%s - %s = %fn", a, b, da-db);  }  ``

When you run this program, you get the following

``   399999999999999 - 399999999999998 = 0.000000     500000000000002 - 500000000000001 = 0.000000  ``

It would seem like Google is using simple 32 bit floating precision (the error here), if you switch float for double in the above code, you fix the issue! Could this be it?

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/mp

,

For more of this kind of silliness see this nice article pertaining to Windows calculator.

The innards of Calc – the arithmetic
engine – was completely thrown away
and rewritten from scratch. The
standard IEEE floating point library
was replaced with an
arbitrary-precision arithmetic
library. This was done after people
kept writing ha-ha articles about how
Calc couldn’t do decimal arithmetic
correctly, that for example computing
10.21 – 10.2 resulted in 0.0100000000000016.

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