Scala 範例 - 複數運算 (complexOps)
原始程式:complexOps.scala
object complexOps extends Application {
class Complex(val re: Double, val im: Double) {
def + (that: Complex) =
new Complex(re + that.re, im + that.im)
def - (that: Complex) =
new Complex(re - that.re, im - that.im)
def * (that: Complex) =
new Complex(re * that.re - im * that.im,
re * that.im + im * that.re)
def / (that: Complex) = {
val denom = that.re * that.re + that.im * that.im
new Complex((re * that.re + im * that.im) / denom,
(im * that.re - re * that.im) / denom)
}
override def toString =
re + (if (im < 0) "-" + (-im) else "+" + im) + "*i"
}
val x = new Complex(2, 1); val y = new Complex(1, 3)
println(x + y)
}
執行結果:
D:\Scala\code>scalac complexOps.scala
D:\Scala\code>scala complexOps
3.0+4.0*i
page revision: 1, last edited: 15 Oct 2009 06:02