xcode 在 Swift 源代码中发现不可打印的 ASCII 字符
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Unprintable ASCII character found in Swift Source Code
提问by Abhi
Hi, I am new to Swift language , can anyone explain why there is error with PI Symbol here.
嗨，我是 Swift 语言的新手，谁能解释为什么这里的 PI 符号有错误。
import Foundation
class CalculatorBrain
{
private var accumulator = 0.0
func setOperand(operand : Double) {
accumulator = operand
}
func performOperations (symbol: String) {
switch symbol {
case "π" :
accumulator = M_PI
case "√" :
accumulator = sqrt(accumulator)
default : break
}
}
var result : Double {
get{
return accumulator
}
}
}
reference https://youtu.be/j50mPzDMWVQ?t=2303
回答by gnasher729
In Xcode: "Editor" menu, "Show Invisibles". That will show you invisible characters in your source code.
在 Xcode 中：“编辑器”菜单，“显示隐形”。这将在您的源代码中显示不可见的字符。
回答by Krishna Vivekananda
This answer is for the people who are using windows keyboard with mac system.
这个答案适用于在 mac 系统上使用 windows 键盘的人。
While typing you might have unknowingly clicked the right clickkey in your keyboard, which will create the Unprintable ASCII character that is causing the Unprintable ASCII character found in source fileerror.
键入时，您可能在不知不觉中单击了键盘上的右键单击键，这将创建无法打印的 ASCII 字符，从而导致在源文件中发现的无法打印的 ASCII 字符错误。
To check this go to find and click the right clickkey and you can find them in your class and delete those characters and the error will be gone.
要检查这一点，请查找并单击右键单击键，您可以在班级中找到它们并删除这些字符，错误就会消失。
Thanks
谢谢
