“期待会员声明”

Question

我在处理这些代码行时遇到了问题：

class MainActivity : ComponentActivity() {
    var item = "None"
    var price: Double = 16.99
    var Quantity: Int = 2
    println(Calculate(price, item, Quantity)) 
}
fun Calculate(price: Double, item: String, Quantity: Int): Double {
    return(Quantity*price)
}

Answer 1

不能直接在类下使用语句，它们应该位于构造函数或方法内。例如：

class MainActivity  {
    var item = "None"
    var price: Double = 16.99
    var Quantity: Int = 2
    fun someFunc() {
        println(Calculate(price, item, Quantity)) 
    }
}