Why I can't run this code?

1 
class Task3(
      override val TAG: String,
      private val generations: Int
) : HomeWorkSolution() {

override fun answer(): Double {

    var num = 0
    var div = 0

    for (i in 0..generations) {

        val a = Random.nextDouble(0.0, 1.0)
        val b = Random.nextDouble(0.0, 1.0)
        val c = Random.nextDouble(0.0, 1.0)

        if (isEquation(a, b)) {

            if (isSolutionInRealNumbers(a, b, c)) num++
            div++
        }
    }

    return num.toDouble() / div

}


private fun isSolutionInRealNumbers(a: Double, b: Double, c: Double) = b * b - 4 * a * c >= 0

private fun isEquation(a: Double, b: Double) = a != 0.0 || b != 0.0

}
2

What error are you getting? What is answer() overriding?