operator keyword (C# Conversion Keywords)

The operator keyword is used to overload a built-in operator or to provide a user-defined conversion in a class or struct declaration.

Example: The following example overloads the + and * operators to perform fractional addition and multiplication, and also provides a conversion operator that converts a Fraction type to a double type.

class Fraction

{

int iNum, iDen;

public Fraction(int iNum, int iDen)

{

this.iNum = iNum;

this.iDen = iDen;

}

// overload operator +

public static Fraction operator +(Fraction x, Fraction y)

{

return new Fraction(x.iNum * y.iDen + y.iNum * x.iDen, x.iDen * y.iDen);

}

// overload operator *

public static Fraction operator *(Fraction x, Fraction y)

{

return new Fraction(x.iNum * y.iNum, x.iDen * y.iDen);

}

// user-defined conversion from Fraction to double

public static implicit operator double(Fraction oFraction)

{

return (double)oFraction.iNum / oFraction.iDen;

}

}

class Test

{

static void Main()

{

Fraction x = new Fraction(1, 2);

Fraction y = new Fraction(3, 7);

Fraction z = new Fraction(2, 3);

Console.WriteLine((double)(x * y + z));

}

}

/*Output: 0.880952380952381*/