YouTipScala Escape Char
In Scala, escape characters are used to represent special characters that cannot be directly written in string literals.
Escape characters start with a backslash followed by a specific character, representing some special meaning or effect.
The following table lists common escape characters:
| Escape Character | Description |
| --- | --- |
| `b` | Backspace |
| `t` | Tab |
| `n` | Line Feed |
| `f` | Form Feed |
| `r` | Carriage Return |
| `"` | Double Quote |
| `'` | Single Quote |
| `` | Backslash |
In characters or strings, Unicode characters between 0 and 255 can be represented using an octal escape sequence, which is a backslash followed by up to three octal digits.
If the character sequence after the backslash does not form a valid escape sequence, it will cause a compilation error.
The following example demonstrates the use of some escape characters:
## Example
object Test {
def main(args: Array){
println("Hellot Worldnn");
}
}
[Run Example Β»](#)
Executing the above code produces the following output:
$ scalac Test.scala $ scala TestHelloWorld
The following is a Scala program example demonstrating the use of various escape characters:
## Example
object EscapeCharacterExamples {
def main(args: Array): Unit ={
val backspace ="Hellob World"// "HelloWorld"
val tab ="Hellot World"// "Hello World"
val newline ="Hellon World"// "Hello
// World"
val formFeed ="Hellof World"// "Hello World"
val carriageReturn ="Hellor World"// "World"
val doubleQuote ="He said, "Hello, World!""// "He said, "Hello, World!""
val singleQuote ='"'// '"'
val backslash ="This is a backslash: "// "This is a backslash: "
// Output examples
println(s"Backspace: $backspace")
println(s"Tab: $tab")
println(s"Newline: $newline")
println(s"FormFeed: $formFeed")
println(s"CarriageReturn: $carriageReturn")
println(s"DoubleQuote: $doubleQuote")
println(s"SingleQuote: $singleQuote")
println(s"Backslash: $backslash")
}
}
Executing the above code produces the following output:
γ
Backspace: HelloWorldTab: HelloWorldNewline: HelloWorldFormFeed: HelloWorldCarriageReturn: WorldDoubleQuote: He said, "Hello, World!"SingleQuote: "Backslash: This is a backslash:
**Example Explanation:**
* **`b` (Backspace)**: Moves the cursor back one position but does not delete characters. For example, `"HellobWorld"` results in `HelloWorld`, where the does not delete "o", so the actual display effect depends on the terminal or output device.
* **`t` (Tab)**: Inserts a horizontal tab, equivalent to a certain number of spaces. `"HellotWorld"` inserts a tab between "Hello" and "World", typically four or eight spaces.
* **`n` (Line Feed)**: Moves to the beginning of the next line for new output. `"HellonWorld"` displays "Hello" and "World" on two separate lines.
* **`f` (Form Feed)**: Inserts a form feed, usually used to control printer page breaks, but generally has no visible effect in console output.
* **`r` (Carriage Return)**: Returns to the beginning of the current line. `"HellorWorld"` overwrites the content of the current line, displaying "World".
* **`"` (Double Quote)**: Inserts a double quote. `"He said, "Hello, World!""` displays `He said, "Hello, World!"`.
* **`'` (Single Quote)**: Inserts a single quote. Usually used in character literals, such as `''''` represents a single quote character.
* **`` (Backslash)**: Inserts a backslash. `"This is a backslash: "` displays `This is a backslash: `.