Scala的阶乘

package hfd
import scala.language.postfixOps
//需求：给整数添加一个功能，求阶乘
//5！=1*2*3*4*5=120
object Test38_2 {
  implicit class xxxx(d:Int){
    def ! :Int={
      var result = 1
      for (i <- 1 to d) {
        result *= i
      }
    result
    }
  }
  //println("阶乘函数被调用",d)
      120  //写代码，完成1*2*3*...*d


  def main(args: Array[String]): Unit = {
    println(5.!)
    println(6!)
    //var i=1
  }
}