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Kotlin, Google's official development language for beginners

코틀린을 처음접하는데 왜 에러가 나는지 모르겠습니다

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fun main(args : Array<String>){

f3(3 , 2.2)
f1()
}

fun f1(){
println("함수 f1이 실행 되었습니다.")
}

fun f3(a1 : int = 0, a2 : double = 0.0){
println("a1 : ${a1}")
println("a2 : ${a2}")
}

왜 에러가 나느지 모르겠습니다
unsolved int double 여기서 int랑 double이 빨간글씨로 적혀 있습니다.................................
kotlin

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