PascalABC.NET is a Pascal programming language that implements classic Pascal, most Delphi language features, as well as a number of their own extensions. It is implemented on the .NET Framework platform and contains all the modern language features, such as classes, operator overloading, interfaces, exception handling, generic classes and routines, garbage collection, lambda expressions, parallel programming tools (OpenMP only as of 2016). PascalABC.NET is also a simple and powerful integrated development environment with an integrated debugger, IntelliSense system, form designer, code templates and code auto-formatting. The command-line PascalABC.NET compiler is also available on Linux and MacOS (under Mono). PascalABC.NET is popular in Russian schools and universities. In the Southern Federal University, it is used as the main language for teaching students of Information Technology in the course "Fundamentals of programming", and for teaching children in one of the largest computer schools in Russia. Key features of PascalABC.NET Pascal language extensions Operators += -= *= /= in-block variable definitions Variable declaration in for loop header Variable declaration with initialization (var n: integer := 10;) Variable type deduction (var x := 1;) foreach Routines with a variable number of parameters set of any type (set of integer) Methods in records Methods defined in class declaration Simplified syntax of units Keyword new (invoking a constructor) Field initializers Operator overloading Static constructors Directives OpenMP case for strings function type syntax T->T tuple type syntax (T1, T2) yield and yield sequence pattern matching array slices interpolated strings unpacking of parameters of lambda expressions into variables System units Most units are focused on education: Raster graphics units GraphABC (based on Windows Forms), GraphWPF (based on WPF) Vector graphics units ABCObjects (based on Windows Forms), WPFObjects (based on WPF) 3D graphics & animation unit Graph3D (based on the Helix Toolkit library) Unit FormsABC to create simple windows application without form designer Units-executors Robot and Drawman (school computer science) Samples 1. Swap the first and second halves of an array begin var a := ArrGen(10,i->2*i+1); a.Println; Assert(a.Length mod 2 = 0); var n := a.Length div 2; a := a[n:] + a[:n]; a.Println; end. 2. 100! begin var p: BigInteger := 1; for var i:=1 to 100 do p := p * i; Println(p); end. 3. Greater common divisor of two integers begin var (a, b) := ReadInteger2; while b > 0 do (a, b) := (b, a mod b); var GCD := Abs(a); GCD.Print; end. 4. Display