![g(x)=[x] -1](https://img.qammunity.org/2019/formulas/mathematics/high-school/gksr8c0erbeelwcsaf1tl9wdnkp4itlfo1.png)
is an example of a greatest integer function.
The greatest integer function takes in a real number and gives out the greatest integer that is less than that number.
So the domain of g(x) is all real numbers
<b> Any real value you plug in to the above function will be defined </b>