练代码记录

package my.demo

import kotln.text.*

    fun main() {
        println("hello world")
    }
fun main(args: Array<String>) {
    println(args.contentToString())
}

    fun main() {
    //sampleStart
        print("hello")
        print("world!")
    //sampleEnd
    }

    fun main() {
//sampleStart
        println("hello world!")
        println(100)
//sampleEnd
    }



//sampleStart
    fun sum(a: Int, b: Int):Int{  //返回值是Int
        return a + b
    }
//sampleEnd