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To Create a shared or static field Do this Add the Shared or static keyword to the declaration. Visual Basic Shared m_number As Integer // Visual C# static int m_number; Add the Shared or static keyword to the declaration. Visual Basic Public Shared Property Number() As Integer Get Return m_number End Get Set(ByVal Value As Integer) m_center = Value End Set End Property // Visual C# public static int Number { get { return m_number; } set { m_number = value; } } Add the Shared or static keyword to the declaration. Visual Basic Public Shared Sub SomeMethod() End Sub // Visual C# public static void SomeMethod() { } Add the Shared or static keyword to the declaration. Visual Basic Shared Sub New() End Sub // Visual C# static Card() { } In Visual Basic, use the class name or an instance name. In Visual C#, use the class name. Visual Basic SomeClass.Number = 5 SomeClass.SomeMethod() // Visual C# SomeClass.Number = 5; SomeClass.SomeMethod();
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12: Overloading Operators with Visual C#
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In this chapter, you ll learn how to Overload the arithmetic +, , and * operators. Overload the == and != relational operators. Use delegates to control program behavior at run time.
In 4, you saw how overloading methods allowed you to implement several different but related behaviors under one method name. In 5, you saw how the same method name could implement different but related behaviors in derived classes. With operator overloading, you ll see how a C# operator can behave differently depending on the context in which it appears. For example, if you use the + operator with two integer operands, as in 1 + 1, the result is another integer, 2. In this chapter, you ll overload the + operator to add two vectors, so that the sum of two vectors, vector A + vector B, returns a third v ector, vector C. Visual Basic .NET doesn t support operator overloading. Depending on the problem you re solving, operator overloading might be a deciding factor in whether you implement the application in Visual Basic or Visual C#. Even if you aren t using Visual C#, you might want to read through the implementation of the user interface to see how delegates are used. The method works equally well in Visual Basic, as you ll see in 13, Saving Instance Data.
A Short Lesson on Vectors
In this chapter, you ll use the vector as the basis for an exercise in overloading operators. A vector is a line segment with direction and magnitude. You can specify both the direction and magnitude of the vector by specifying a coordinate pair (x, y). Using this notation, the three vectors in the following diagram are (2, 4), (3, 0), and ( 4, 4).
Addition, subtraction, multiplication, and equality are defined on vectors, making the vector a good candidate for operator overloading. Vector addition is defined by placing two vectors end to end, with the first vector placed at the origin. The sum is the vector from the origin to the end of the second vector. The x value of the vector sum is the sum of the x components of the two vectors. Similarly, the y value is the sum of the y components of the two vectors. The sum of (1, 3) and (3, 1) is (4, 4), and is shown in the following diagram.
You can also multiply a vector by a scalar. A vector is multiplied by a scalar (a nonvector value) by multiplying both the x and y components by the scalar. For example, 2 * (1, 3) = (2, 6). Note that you can also multiply a vector times a vector, but you won t go that far in this chapter. Vectors can also be subtracted. To subtract a vector B from a vector A multiply vector B by 1 and add it to vector A. The difference (1, 3) (3, 1) = ( 2, 2) is shown in the following diagram.
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