object HelloWorld { // tail recursion optimisation, inak tiez Tail calls
def add(a:Int, b: Int):Int = { // klasicka rekurzivna funkcia
if (a == 0) b; // return nemusime pisat, sme vo funckionalnom svete, posledny vyraz je vystupna hodnota
else add(a-1, b)+1;
}
def add1(a:Int, b: Int):Int = { // iterativna verzia
if (a == 0) b;
else add1(a-1, b+1); // po tomto volani sa nerobi nic, takze je to goto
}
def fib(n : Int) : Int = { // sucin cisel 1.2. ... n
if (n < 2) 1
else fib(n-2) + fib(n-1);
}
def fact(n: Int): Int = {
def fact(n: Int, acc: Int): Int =
if (n <= 0) acc
else fact(n-1, n*acc)
fact(n, 1)
}
def sum(n: Int): Int = { // sucet cisel 1+2+3+ ... +n
@annotation.tailrec
def sum(n: Int, acc: Int): Int =
if (n <= 0) acc
else sum(n-1, n+acc) // akumulatorova technika
sum(n, 0)
}
def collatz(n : Int): Int = { // vrati dlzku collatzovej postupnosti zacinajucej od n
if (n == 1) 0
else if (n % 2 == 0) 1+collatz(n/2)
else 1+collatz(3*n+1)
}
def collatz1(n : Int): Int = { // vrati dlzku collatzovej postupnosti zacinajucej od n
@annotation.tailrec
def collatz1(n : Int, count : Int): Int = { // vrati dlzku collatzovej postupnosti zacinajucej od n
if (n == 1) count
else if (n % 2 == 0) collatz1(n/2, count+1)
else collatz1(3*n+1, count+1)
}
collatz1(n, 0)
}
def main(args: Array[String]) {
println(add(10000, 10000)) // toto padne na stacku
// println(add(100000, 100000)) // toto padne na stacku
val milion = 1000000000
println(add1(milion , milion) + "=" + (2*milion)) // Gaussov vzorec)
println("fibs=" + List.range(1, 20).map { fib })
println("facts=" + List.range(1, 20).map { fact })
println("sums=" + List.range(1, 20).map { sum })
val stoLitrov = milion/10
println(sum(stoLitrov) + "=" + (stoLitrov*(stoLitrov+1)/2)) // Gaussov vzorec
println(List.range(1,1000).map { n => collatz(n) })
val desatLitrov = 10000
//println(List.range(1,desatLitrov).map { n => collatz(n) }.max) // OutOfMemoryError: GC overhead limit exceeded
// println(List.range(1,desatLitrov).map { n => collatz1(n) }.max)
var max = -1
for(i <- 1 to stoLitrov) {
val len = collatz1(i)
if (len > max)
max = len
}
println(max)
}
}
About Online Scala Compiler
Try our Online Scala Compiler (Version Scala v2.11.12) to Edit, Run, and Share your Scala Code directly from your browser. This online development environment provides you the latest version Scala v2.11.12.
How to use Online Scala Compiler?
Write and Execute Code
- Write your program (or, paste it) directly under the "Source Code" tab.
- If you want to save your program, go to the "Project" menu and save it.
- You can directly execute your program without saving it by clicking on on "Execute" button.
User Input
The latest version of Coding Ground allows to provide program input at run time from the termnial window exactly the same way as you run your program at your own computer. So simply run a program and provide your program input (if any) from the terminal window available in the right side.
Online Scala Compiler: Keyboard Shortcuts
The following are the keyword shortcut of this Online Scala Compiler:
Shortcut | Description |
⌘ + Enter | Run the program |
⌘ + S | Save Project (Login Required) |
⇧ + ⌘ + S | Save As Project |
⌘ + P | New Project |
⌘ + G | Share Project |
⌘ + Z | Undo Editing |
⌘ + Y | Redo Editing |
⌘ + A | Select All Text |
⌘ + X | Cut Selected Text |
⌘ + C | Copy Selected Text |
⌘ + V | Paste Copied Text |
⌘ + F | Search Text |
⌘ + ⌥ + F | Replace Text |
Shortcut | Description |
Ctrl + Enter | Run the program |
Ctrl + S | Save Project |
Shift + Ctrl + S | Save As Project |
Ctrl + G | Share Project |
Ctrl + Z | Undo Editing |
Ctrl + Y | Redo Editing |
Ctrl + A | Select All Text |
Ctrl + X | Cut Selected Text |
Ctrl + C | Copy Selected Text |
Ctrl + V | Paste Copied Text |
Ctrl + F | Search Text |
Ctrl + H | Replace Text |
Online Scala Compiler: Save and Share Scala Code (Project)
Save Scala Project Online
You can save your Scala Project with us so that you can access this project later on. To save a project you will need to create a login Id with us. So before you save a project, please create a login Id using a link given at the top right corner of this page.
Share Scala Project Online
You can use this feature to share your Scala Code with your teachers, classmates and colleagues. Just click Share Button and it will create a short link, which can be shared through Email, WhatsApp or even through Social Media. A shared link will be deleted if it has been passive for almost 3 months.
More Features of Online Scala Compiler
- Theme – You can change the current editor's theme from the "Editor Theme" option under "Settings" menu.
- Font Size – You can change the font size of the editor /compiler from from the "Font Size" option under "Settings" menu.
- Tab Size – You can change the tab size from the "Tab Size" option under "Settings" Menu.
- Show/Hide Line Numbers – You can show/hide the line number with the code from the "Show Line Numbers" or "Hide Line Numbers" option under "Settings" Menu.
- And, many more.
Benefits of Using Online Scala Compiler
There are several benefits of using the Online Scala Compiler to run your Scala code:
- Platform independence: You can run your code from any device without taking care of operating systems.
- Convenience: You don't need to install anything for using this.
- No setup required: There is no need for additional setup to run your code.
- Updated version: Our online compiler/editors/terminals are the latest up-to-date.