Operator Overloading: A Complex Number Class : operator overload « Operator Overload « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Operator Overload
3. operator overload

1. If you overload the == operator, then you need to override Equals(object) and GetHashCode().
2. The == operator and the Equals(object) methods should function the same way.

1. When Equals() is overridden, you should also override GetHashCode().
2. Equals() and GetHashCode should be compatible.

using System;

struct Complex
{
    float real;
    float imaginary;
    
    public Complex(float real, float imaginary)
    {
        this.real = real;
        this.imaginary = imaginary;
    }
    
    public float Real
    {
        get
        {
            return(real);
        }
        set
        {
            real = value;
        }
    }
    
    public float Imaginary
    {
        get
        {
            return(imaginary);
        }
        set
        {
            imaginary = value;
        }
    }
    
    public override string ToString()
    {
        return(String.Format("({0}, {1}i)", real, imaginary));
    }
    
    public static bool operator==(Complex c1, Complex c2)
    {
        if ((c1.real == c2.real) && (c1.imaginary == c2.imaginary))
           return(true);
        else
           return(false);
    }
    
    public static bool operator!=(Complex c1, Complex c2)
    {
        return(!(c1 == c2));
    }
    
    public override bool Equals(object o2)
    {
        Complex c2 = (Complex) o2;
        
        return(this == c2);
    }
    
    public override int GetHashCode()
    {
        return(real.GetHashCode() ^ imaginary.GetHashCode());
    }
    
    public static Complex operator+(Complex c1, Complex c2)
    {
        return(new Complex(c1.real + c2.real, c1.imaginary + c2.imaginary));
    }
    
    public static Complex operator-(Complex c1, Complex c2)
    {
        return(new Complex(c1.real - c2.real, c1.imaginary - c2.imaginary));
    }
    
    public static Complex operator*(Complex c1, Complex c2)
    {
        return(new Complex(c1.real * c2.real - c1.imaginary * c2.imaginary,
        c1.real * c2.imaginary + c2.real * c1.imaginary));
    }
    
    public static Complex operator/(Complex c1, Complex c2)
    {
        if ((c2.real == 0.0f) && (c2.imaginary == 0.0f))
           throw new DivideByZeroException("Can't divide by zero Complex number");
        
        float newReal = (c1.real * c2.real + c1.imaginary * c2.imaginary) / (c2.real * c2.real + c2.imaginary * c2.imaginary);
        float newImaginary = (c2.real * c1.imaginary - c1.real * c2.imaginary) / (c2.real * c2.real + c2.imaginary * c2.imaginary);
        
        return(new Complex(newReal, newImaginary));
    }
  
}

class MainClass
{
    public static void Main()
    {
        Complex c1 = new Complex(3, 1);
        Complex c2 = new Complex(1, 2);
        
        Console.WriteLine("c1 == c2: {0}", c1 == c2);
        Console.WriteLine("c1 != c2: {0}", c1 != c2);
        Console.WriteLine("c1 + c2 = {0}", c1 + c2);
        Console.WriteLine("c1 - c2 = {0}", c1 - c2);
        Console.WriteLine("c1 * c2 = {0}", c1 * c2);
        Console.WriteLine("c1 / c2 = {0}", c1 / c2);
    }
}

c1 == c2: False
c1 != c2: True
c1 + c2 = (4, 3i)
c1 - c2 = (2, -1i)
c1 * c2 = (1, 7i)
c1 / c2 = (1, -1i)