cos

Требования к платформе и версии: Common (1.2), Wasm-JS (1.8), Wasm-WASI (1.8)

expect fun cos(x: Double): Double

Вычисляет косинус угла x, заданного в радианах.

Особые случаи:

cos(NaN|+Inf|-Inf) — это NaN

Примеры

import kotlin.math.*
import kotlin.test.*

fun main() { 
   //sampleStart 
   val epsilon = 1e-10

println(cos(0.0)) // 1.0
// Results may not be exact, so we're only checking that they are within epsilon from the expected value
// cos(π/2) = 0
println("cos(PI / 2).absoluteValue < epsilon is ${cos(PI / 2).absoluteValue < epsilon}") // true
println(cos(PI)) // -1.0

// special cases
println(cos(Double.NaN)) // NaN
println(cos(Double.POSITIVE_INFINITY)) // NaN
println(cos(Double.NEGATIVE_INFINITY)) // NaN 
   //sampleEnd
}

expect fun cos(x: Float): Float

Вычисляет косинус угла x, заданного в радианах.

Особые случаи:

cos(NaN|+Inf|-Inf) — это NaN

Примеры

import kotlin.math.*
import kotlin.test.*

fun main() { 
   //sampleStart 
   val epsilon = 1e-6f

println(cos(0.0f)) // 1.0
// Results may not be exact, so we're only checking that they are within epsilon from the expected value
// cos(π/2) = 0
println("cos(PI.toFloat() / 2).absoluteValue < epsilon is ${cos(PI.toFloat() / 2).absoluteValue < epsilon}") // true
println(cos(PI.toFloat())) // -1.0

// special cases
println(cos(Float.NaN)) // NaN
println(cos(Float.POSITIVE_INFINITY)) // NaN
println(cos(Float.NEGATIVE_INFINITY)) // NaN 
   //sampleEnd
}

Требования к платформе и версии: JS (1.2), JVM (1.2)

actual inline fun cos(x: Double): Double

Вычисляет косинус угла x, заданного в радианах.

Особые случаи:

cos(NaN|+Inf|-Inf) — это NaN

Примеры

import kotlin.math.*
import kotlin.test.*

fun main() { 
   //sampleStart 
   val epsilon = 1e-10

println(cos(0.0)) // 1.0
// Results may not be exact, so we're only checking that they are within epsilon from the expected value
// cos(π/2) = 0
println("cos(PI / 2).absoluteValue < epsilon is ${cos(PI / 2).absoluteValue < epsilon}") // true
println(cos(PI)) // -1.0

// special cases
println(cos(Double.NaN)) // NaN
println(cos(Double.POSITIVE_INFINITY)) // NaN
println(cos(Double.NEGATIVE_INFINITY)) // NaN 
   //sampleEnd
}

actual inline fun cos(x: Float): Float

Вычисляет косинус угла x, заданного в радианах.

Особые случаи:

cos(NaN|+Inf|-Inf) — это NaN

Примеры

import kotlin.math.*
import kotlin.test.*

fun main() { 
   //sampleStart 
   val epsilon = 1e-6f

println(cos(0.0f)) // 1.0
// Results may not be exact, so we're only checking that they are within epsilon from the expected value
// cos(π/2) = 0
println("cos(PI.toFloat() / 2).absoluteValue < epsilon is ${cos(PI.toFloat() / 2).absoluteValue < epsilon}") // true
println(cos(PI.toFloat())) // -1.0

// special cases
println(cos(Float.NaN)) // NaN
println(cos(Float.POSITIVE_INFINITY)) // NaN
println(cos(Float.NEGATIVE_INFINITY)) // NaN 
   //sampleEnd
}

Требования к платформе и версии: Native (1.3)

actual external fun cos(x: Double): Double

Вычисляет косинус угла x, заданного в радианах.

Особые случаи:

cos(NaN|+Inf|-Inf) — это NaN

Примеры

import kotlin.math.*
import kotlin.test.*

fun main() { 
   //sampleStart 
   val epsilon = 1e-10

println(cos(0.0)) // 1.0
// Results may not be exact, so we're only checking that they are within epsilon from the expected value
// cos(π/2) = 0
println("cos(PI / 2).absoluteValue < epsilon is ${cos(PI / 2).absoluteValue < epsilon}") // true
println(cos(PI)) // -1.0

// special cases
println(cos(Double.NaN)) // NaN
println(cos(Double.POSITIVE_INFINITY)) // NaN
println(cos(Double.NEGATIVE_INFINITY)) // NaN 
   //sampleEnd
}

actual external fun cos(x: Float): Float

Вычисляет косинус угла x, заданного в радианах.

Особые случаи:

cos(NaN|+Inf|-Inf) — это NaN

Примеры

import kotlin.math.*
import kotlin.test.*

fun main() { 
   //sampleStart 
   val epsilon = 1e-6f

println(cos(0.0f)) // 1.0
// Results may not be exact, so we're only checking that they are within epsilon from the expected value
// cos(π/2) = 0
println("cos(PI.toFloat() / 2).absoluteValue < epsilon is ${cos(PI.toFloat() / 2).absoluteValue < epsilon}") // true
println(cos(PI.toFloat())) // -1.0

// special cases
println(cos(Float.NaN)) // NaN
println(cos(Float.POSITIVE_INFINITY)) // NaN
println(cos(Float.NEGATIVE_INFINITY)) // NaN 
   //sampleEnd
}

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.math/cos.html