Android kotlin复数

data class ComplexNumber(val real: Double, val imaginary: Double) {
    operator fun plus(other: ComplexNumber): ComplexNumber {
        return ComplexNumber(this.real + other.real, this.imaginary + other.imaginary)
    }

    operator fun minus(other: ComplexNumber): ComplexNumber {
        return ComplexNumber(this.real - other.real, this.imaginary - other.imaginary)
    }

    operator fun times(other: ComplexNumber): ComplexNumber {
        val realPart = this.real * other.real - this.imaginary * other.imaginary
        val imaginaryPart = this.real * other.imaginary + this.imaginary * other.real
        return ComplexNumber(realPart, imaginaryPart)
    }

    override fun toString(): String {
        return if (imaginary >= 0) "$real + ${imaginary}i" else "$real - ${-imaginary}i"
    }
}