Question about display of precision

[Walter White]

Hello,

I have a question and hope that you can help me to understand that.

I use str2double to convert a cell array of strings (output from strsplit).

Outputting the cell array of strings, it says 

...
[1,28] = 999999999
...

Outputting the according number in the array converted with str2double says

...
Columns 28 through ...
... 1.0000e+9 ...

But if I explicitly output the converted numeric value in the array it reads 99999999, as expected.

Why is 1.0000e+9 displayed, instead of the "more correct" calue 9.9999e+8 ??

Kind regards,
Walter