To define a variable that holds numeric data, simply assign it as you would other variables. PowerShell automatically stores your data in a format that is sufficient to accurately hold it.

$myInt = 10

$myInt gets the value of 10, as a (32-bit) integer.

$myDouble = 3.14

$myDouble gets the value of 3.14, as a (53-bit, 9 bits of precision) double.

To explicitly assign a number as a long (64-bit) integer or decimal (96-bit, 96 bits of precision), use the long and decimal suffixes:

$myLong = 2147483648L

$myLong gets the value of 2147483648, as a long integer.

$myDecimal = 0.999D