Integer Part of Numbers. Fractional Part of Number

Suppose, `x` is the real number.

Its integral part is the greatest integral number, that isn′t exceed `x`.

The integral part of number `x` denotes as `[x]`.

The fractional number of number `x` is difference between the number and its integral part, i.e. `x-[x]` .

The fractional part of number `x` denotes as `{x}`.

For example,

`[3.47]=3; {3.47}=0.47;`

`[-2.3]=-3; {-2.3}=-2.3-(-3)=0.7;`

`[15]=15; {15}=0`