KOTLIN somo la 17: method na properties za namba

Kukadiria namba 

Chukulia mfano 10/3 = 2.5. Sasa tukiikadiria hapa tutapata 3. Kufanya hivi tutatumia method ya roundToInt(). Kwanza tuta import math library. Library hii inahusu mahesabu tu. tunakuja jifunza zadi jinsi ya kutengeneza library yetu wenyewe masomo yanayofuata.

import kotlin.math.roundToInt

fun main() {

   val jibu: Double = 10.0 / 4.0

   println(jibu)

   println(jibu.roundToInt())

}

Kuangalia sifa za namba yani properties:

Namba shufwa (isEven)

Hii itatoa jibu true ikiwa kweli na false ikiwa si kweli. Tutashtua kama 4 ni shufwa

fun main() {

   val isEven: (Int) -> Boolean = { it % 2 == 0 }

   println(isEven(4))

}

Kutengeneza hashcode ya namba (hashCode)

Hii itakuletea hashcode ya namba husika. Kwa mfano, neno “bongoclass”  tunakwenda kuitengenezea hashcode

fun main() {

   val number = "bongoclass"

   println(number.hashCode())

}

2084316335

Kunagalia kama namba ni hasi tutatumia isNegative

Kuangalia kama namba ni infinit - haina mwisho tutatumia isInfinit

Kuangalia kama namba ni finit - ina mwisho tutatumia isFinite

Kuangalia kama namba sio negative - hasi tutatumia isNan

Kuangalia kama namba ni witiri yaani odd tutatumia isOdd

fun isInfinit(number: Double): Boolean = number.isInfinite()

fun isFinite(number: Double): Boolean = number.isFinite()

fun isNan(number: Double): Boolean = number.isNaN()

fun isOdd(number: Int): Boolean = number % 2 != 0

fun main() {

   val number = 4.0

   Check conditions for a Double

   println(isInfinit(number))

   println(isFinite(number))

   println(isNan(number))

   Check condition for an Int

   println(isOdd(4))

}

Kubadili namba kuwa string toString

fun main() {