KOTLIN somo la 17: method na properties za namba
Katika somo hili tutajifunza kuhusu method na properties za Kotlin zinazofanya kazi kwenye 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))
}
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