> For the complete documentation index, see [llms.txt](https://alvintoh.gitbook.io/apache-2-0-spark-with-scala/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://alvintoh.gitbook.io/apache-2-0-spark-with-scala/section-2-scala-crash-course/5.-exercise-scala-basics-part-2.md).

# 5. \[Exercise] Scala Basics, Part 2

## Activity

* When you look at the file LearningScala1.sc
* The syntax for Scala allows you to set printf which is formatting

  ```
    // printf style:

    println(f"Pi is about $piSinglePrecision%.3f")
    //> Pi is about 3.142

    println(f"Zero padding on the left: $numberOne%05d")
    //> Zero padding on the left: 00001
  ```
* Scala allows you to subsitite variables with s prefix

  ```
    // Substiting in variables

    println(s"I can use s prefix to ue variable like $numberOne $truth $letterA")
    //> I can use the s prefix to use variables like 1 true a
  ```
* Scala allows you to substitute expressions with curly brackets

  ```
    // Substituting expressions (with curly brackets):

    println(s"The s prefix isn't limited to variables; I can include any expression. Like ${1+2}")
    //> The s prefix isn't limited to variables; I can include any expression. Like 3
  ```
* Scala can also use regular expression
* Dealing with booleans
* You can use >, <, and == to compare across val
* Scala you can use == to compare across two strings to see if both are the same string "Picard" == "Picard"

## Exercise

```
    // EXERCISE
    // Write some code that takes the value of pi, doubles it, and then prints it within a string with
    // three decimal places of precision to the right.
    // Just write your code below here; any time you save the file it will automatically display the results!

    val newPi = pi * 2
    println(f"This is the new Pi: $newPi%.3f")
```