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we see that it is six repetitions of the original three elements. As with addition, first a new larger array is created during multiplication, then the component elements are copied into it. This has the same issue that addition had, where the new array is created without type constraints. Even if the original array could only hold numbers, the new array can hold any type of object. 4.1.3 Subtraction, division, and the modulus operator Addition and multiplication are the most interesting of the arithmetic operators in terms of polymorphic behavior, but let s go over the remaining operators. Subtraction, division, and the modulus (%) operators are only defined for numbers by PowerShell. (Modulus returns the remainder from a division operation.) Again, as with all numeric computations, the widening rules for numbers are obeyed. Since, for the basic types (string, number), these operations are only defined for numbers, if either operand is a number (not just the left-hand operand) then an attempt will be made to convert the other operand into a number as well, as shown in the following:
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PS (1) > "123" / 4 30.75 PS (2) > 123 / "4" 30.75 PS (3) >
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In the first example, the string 123 is converted into a number. In the second example, the string 4 will be converted into a number.
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Here is an important characteristic about how division works in PowerShell that you should keep in mind. Integer division underflows into floating point (technically System.Double). This means that 5 divided by 4 in PowerShell results in 1.25 instead of 1 as it would in C#. If you want to round the decimal part to the nearest integer, simply cast the result into [int]. You also need to be aware that PowerShell uses what s called Banker s Rounding when converting floating point numbers into integers. Banker s rounding rounds .5 up sometimes, and down sometimes. The convention is to round to the nearest even number, so that both 1.5 and 2.5 round to 2, and 3.5 and 4.5 both round to 4.
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If neither operand is a number, the operation is undefined and you ll get an error as shown:
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PS (3) > "123" / "4" Method invocation failed because [System.String] doesn't contain a method named 'op_Division'. At line:1 char:8 + "123" / <<<< "4" PS (4) >
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Take note of this particular error message, though. PowerShell has no built-in definition for this operation, so as a last step it looks to see whether the type of the left
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OPERATORS AND EXPRESSIONS
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operand defines a method for performing the operation. In fact, PowerShell looks for the op_<operation> methods on the left operand if the operation is not one of those defined by PowerShell itself. This allows the operators to work on types such as System.Datetime (the .NET representation of dates) even though there is no special support for these types in PowerShell. Here s an example. In the following, we want to find the total number of days between January 1, 2006, and February 1, 2006. We can create objects representing these dates by casting strings into DateTime objects. Once we have these objects, we can convert them:
PS (1) > ([datetime] "2006-2-1" - [datetime]"2006-1-1").TotalDays 31
For those of you with children, here s a more useful example. Jeffrey Snover, the architect of PowerShell tells a story about his daughter:
My daughter loves Christmas. She often asks me, How long is it till Christmas The problem with that is that I m one of those people that can barely remember what year it is, much less the date. Well, it is one thing to be a flawed person and it s another thing to disappoint your daughter. PowerShell to the rescue! Here is a little date math routine I wrote to help me out:
function tillXmas () { $now = [DateTime]::Now [Datetime]( [string] $now.Year + "-12-25") - $Now } PS> tillxmas Days Hours Minutes Seconds Milliseconds Ticks TotalDays TotalHours TotalMinutes TotalSeconds TotalMilliseconds : : : : : : : : : : : 321 18 8 26 171 277997061718750 321.755858470775 7722.14060329861 463328.436197917 27799706.171875 27799706171.875
Thanks to PowerShell, I can tell my daughter how many seconds to go till Xmas! Now if I can only get her to stop asking me in the car.
To take a look at the operator methods defined for System.DateTime, we can use the Getmembers() method. Here s a partial listing of the operator methods defined. We re using the PowerShell Select-String cmdlet to limit what gets displayed to only those methods whose names contain the string op_ :
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