matlab digit precision is not correct?

Quoting from:

https://www.mathworks.com/help/symbolic/increase-precision-of-numeric-calculations.html

By default, MATLAB® uses 16 digits of precision.

But why when I write 900000000+2 (8 zeros after 9) it returns 900000002 but writing 900000000+2 (9 zeros after 9)returns 9.0000e+09 isn't this an 8 digit precision?

Answer 1

[James Tursa]

That is just a display artifact. The entire number is still there in memory. Do this to change the display format

format longg

and then repeat your test.

[Ahmad Agbaria]

Thanks