在 Scala 中，可以嵌套方法定义。以下对象提供了一个 factorial 方法，用于计算给定数字的阶乘
def factorial(x: Int): Int = {
def fact(x: Int, accumulator: Int): Int = {
if (x <= 1) accumulator
else fact(x - 1, x * accumulator)
}
fact(x, 1)
}
println("Factorial of 2: " + factorial(2))
println("Factorial of 3: " + factorial(3))
def factorial(x: Int): Int =
def fact(x: Int, accumulator: Int): Int =
if x <= 1 then accumulator
else fact(x - 1, x * accumulator)
fact(x, 1)
println("Factorial of 2: " + factorial(2))
println("Factorial of 3: " + factorial(3))
此程序的输出为
Factorial of 2: 2
Factorial of 3: 6