barcode vb.net 2013 ARITHMETIC OPERATORS in C#.NET

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PS (5) > [datetime].getmembers()| foreach{"$_"}| select-string op_ System.DateTime op_Addition(System.DateTime, System.TimeSpan) System.DateTime op_Subtraction(System.DateTime, System.TimeSpan) System.TimeSpan op_Subtraction(System.DateTime, System.DateTime)
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As you can see, not all of the arithmetic operator methods are defined. In fact, there are no methods defined for any operations other than addition and subtraction. If you try to divide a DateTime object by a number, you ll get the same error we saw when we tried to divide two strings:
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PS (4) > [datetime] "1/1/2006" / 22 Method invocation failed because [System.DateTime] doesn't contain a method named 'op_Division'. At line:1 char:24 + [datetime] "1/1/2006" / <<<< 22 PS (5) >
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The error occurred because PowerShell was looking for an op_Division() on the object on the left. Since it didn t find one, the operation failed. That s it for the arithmetic operations. However, now that we know how to do arithmetic, it s not very interesting if we can t save the results. Next we need to talk about the assignment operators.
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THE ASSIGNMENT OPERATORS
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In this section we ll cover the assignment operators, which are listed in table 4.2. As you can see, along with simple assignment, PowerShell supports the compound operators that are found in C-based languages. These compound operators retrieve, update, and reassign a variable. In table 4.2, for each of the compound assignment operators, the third column shows the equivalent decomposed operation. Of course, the arithmetic parts of the compound arithmetic/assignment operators follow all of the rules for the arithmetic
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Table 4.2 Operator = += -= *= /= %= PowerShell assignment operators Example $a= 3 $a += 2 $a -= 13 $a *= 3 $a /= 3 $a %= 3 $a = $a + 2 Equivalent Description Sets the variable to the specified value. Performs the addition operation in the existing value, then assigns the result back to the variable.
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$a = $a 13 Performs the subtraction operation in the existing value, then assigns the result back to the variable. $a = $a * 3 $a = $a / 3 Multiplies the value of a variable by the specified value or appends to the existing value. Divides the value of a variable by the specified value.
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$a = $a % 3 Divides the value of a variable by the specified value and assigns the remainder (modulus) to the variable.
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OPERATORS AND EXPRESSIONS
operators described in the previous section. The formal syntax for an assignment expression is:
<lvalueList> <assignmentOperator> <pipeline> <lvalueList> := <lvalue> [ , <lvalue> ] * <lvalue> := <variable> | <propertyReference> | <arrayReference>
One interesting thing to note from this syntax is that multiple assignments are allowed. For example, the expression
$a,$b,$c = 1,2,3,4
is a perfectly legal statement. It says assign 1 to $a, assign 2 to $b, and assign the remaining elements 3 and 4 of the list to $c. Multiple assignments can be used to greatly simplify certain types of operators as we ll see in the next section. 4.2.1 Multiple assignments Multiple assignment works only with the basic assignment operator. You can t use it with any of the compound operators. It can, however, be used with any type of assignable expression such as an array element or property reference. Here s a quick example where multiple assignment is particularly useful. The canonical pattern for swapping two variables is conventional languages is
$temp = $a $a = $b $b = $temp
This takes three lines of code and requires you to use a temporary variable. Here s how to do it using multiple assignments in PowerShell:
$a,$b = $b,$a
It s simple, straightforward, and clean only one line of code with no temporary variable to worry about. Here s a more interesting example. The Fibonacci sequence is a sequence of numbers where each element is defined as the sum of the previous two numbers in the sequence. It looks like:
1 1 2 3 5 8 13 21
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