Question

Kotlin：未解决的参考文献：totalFee

我只是在做这个小小的虚拟程序来练习，但是当试图将值打印到屏幕时，totalFee没有得到解决。我已经看了一段时间了，无法弄清楚原因。 daysRented是先前在程序中声明的int。

if (daysRented <= 10){
    if(insPolicy == true){
       val totalFee = (shortTermRate * daysRented) + (insRate * daysRented)
    }
    else{
        val totalFee = shortTermRate * daysRented
    }
}
else{
    if(insPolicy == true){
        val totalFee = (longTermRate * daysRented) + (insRate * daysRented)
    }
    else{
        val totalFee = longTermRate * daysRented
    }
}
println("Rental fee: $totalFee")

Answer 1

Iterator是一个表达式，所以我将其写为

if

真的应该改进到

val totalFee = if (daysRented <= 10){
    if(insPolicy == true){ // can just be if (insPolicy)
        (shortTermRate * daysRented) + (insRate * daysRented)
    }
    else{
        shortTermRate * daysRented
    }
}
else{
    if(insPolicy == true){
        (longTermRate * daysRented) + (insRate * daysRented)
    }
    else{
        longTermRate * daysRented
    }
}

甚至

val termRate = if (daysRented <= 10) shortTermRate else longTermRate 
val totalFee = 
    if (insPolicy) {
        (termRate * daysRented) + (insRate * daysRented)
    } 
    else {
        termRate * daysRented
    }

Answer 2

使用此代码。

val totalFee: Int
if (daysRented <= 10){
    if(insPolicy){
       totalFee = (shortTermRate * daysRented) + (insRate * daysRented)
    }
    else{
        totalFee = shortTermRate * daysRented
    }
}
else{
    if(insPolicy){
        totalFee = (longTermRate * daysRented) + (insRate * daysRented)
    }
    else{
        totalFee = longTermRate * daysRented
    }
}
println("Rental fee: $totalFee")

Kotlin：未解决的参考

2 个答案: