小编Kei*_*ugh的帖子

什么是Kotlin中的指数运算符.我认为它会,**但它似乎在我的代码中引发错误.

when (pendingOperation) {
    "=" -> operand1 = value
    "÷" -> operand1 = if (value == 0.0) {
        Double.NaN // handle attempt to divide by zero
    } else {
        operand1!! / value
    }
    "x" -> operand1 = operand1!! * value
    "?" -> operand1 = operand1!! - value
    "+" -> operand1 = operand1!! + value
    "a^b" -> operand1 = operand1!! ** value

嗨，我对编程非常陌生，但这是我遇到的错误。这是我的代码...

override fun onRestoreInstanceState(savedInstanceState: Bundle?) {
    super.onRestoreInstanceState(savedInstanceState)
    val savedString = savedInstanceState?.getString(TEXT_CONTENTS, "")
    editText2?.text = savedString
}

最后的savedString 表达式我收到错误“Required Editable! found String?”