我新近在scala并试图通过一些简单的scala工作表。scala - 错误:未找到:值
IDE是Intellij IDEA社区版和OS Ubuntu 12.04,sbt
已正确安装。
但它抛出错误 - error: not found: value
OI不明白为什么出现这种情况:
代码:从屏幕的右侧
object session {
1 + 2
def abs(x: Double) = if (x < 0) -x else x <== update this line
def sqrtIter(guess: Double, x: Double): Double =
if (isGoodEnough(guess, x)) guess
else sqrtIter(improve(guess, x), x)
def isGoodEnough(guess: Double, x: Double) =
abs(guess * guess - x) < 0.001
def improve(guess: Double, x: Double) =
(guess + x/guess)/2
def sqrt(x: Double) = sqrtIter(1.0, x)
sqrt(2)
sqrt(4)
}
输出:
> res0: Int = 3
> <console>:8: error: not found: value isGoodEnough
if (isGoodEnough(guess, x)) guess else sqrtIter(improve(guess, x), x)
^
<console>:8: error: not found: value improve
if (isGoodEnough(guess, x)) guess else sqrtIter(improve(guess, x), x)
^
> <console>:8: error: not found: value abs
abs(guess * guess - x) < 0.001
^
> improve: (guess: Double, x: Double)Double
> <console>:7: error: not found: value sqrtIter
def sqrt(x: Double) = sqrtIter(1.0, x)
^
> <console>:8: error: not found: value sqrt
sqrt(2)
^
> <console>:8: error: not found: value sqrt
sqrt(4)
有什么建议吗?
谢谢,正是我需要的。另一方面,为了清晰起见,我更喜欢只导入程序需要的内容,所以我建议使用“import math.abs”。 –