Operator overloading concept in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to overload the plus operator for the Point class.

Kotlin

operator fun Point.plus(other: Point): Point = Point(this.x [1] other.x, this.y + other.y)

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A-

B+

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using a minus or other operator instead of plus.

Forgetting the operator keyword.

The plus operator is overloaded by defining operator fun plus and using the + symbol to add the x coordinates.

2fill in blank

medium

Complete the code to overload the times operator for the Vector class.

Kotlin

operator fun Vector.times(scalar: Int): Vector = Vector(this.x [1] scalar, this.y * scalar)

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A+

B/

C*

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using plus or minus instead of multiplication.

Forgetting to mark the function with operator.

The times operator multiplies each coordinate by the scalar using the * symbol.

3fill in blank

hard

Fix the error in the operator overloading function to correctly overload the unary minus operator.

Kotlin

operator fun Point.[1](): Point = Point(-this.x, -this.y)

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Anot

Bminus

CunaryPlus

DunaryMinus

Attempts:

3 left

💡 Hint

Common Mistakes

Using minus which requires a parameter.

Using unaryPlus instead of unaryMinus.

The unary minus operator is overloaded by defining operator fun unaryMinus().

4fill in blank

hard

Fill both blanks to overload the compareTo operator for the Box class to compare volumes.

Kotlin

operator fun Box.compareTo(other: Box): Int = this.volume() [1] other.volume() [2] 0

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A-

B+

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using comparison operators like > or < instead of subtraction.

Omitting the operator keyword.

The compareTo operator returns the difference of volumes, so subtract volumes and add zero to complete the expression.

5fill in blank

hard

Fill all three blanks to overload the get operator for the Matrix class to access elements by row and column.

Kotlin

operator fun Matrix.get([1]: Int, [2]: Int): Int = data[[1]][[3]]

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Arow

Bcol

Ccolumn

Dindex

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent parameter names.

Using the same name for both parameters.

The get operator uses two parameters, typically named row and column. The data is accessed by data[row][column].