在Scala中是可以定义嵌套函数的。下面定义了函数factorial，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))
程序输出结果是：
Factorial of
2:
2
Factorial of
3:
6
