//Visual Basic 2010 Recursie Procedures en Functies
public class Example3 {
    void Main() {
        Console.WriteLine(this.GetCommonDivisor(3, 9));
        Console.WriteLine(this.GetCommonDivisor(3, -9));
        Console.WriteLine(this.GetCommonDivisor(8, 3));
        Console.WriteLine(this.GetCommonDivisor(-3, -8));
        Console.WriteLine(this.GetCommonDivisor(6, 0));
        Console.WriteLine(this.GetCommonDivisor(0, 6));
        Console.WriteLine(this.GetCommonDivisor(8, 12));
        Console.WriteLine(this.GetCommonDivisor(9, 9));
        Console.ReadLine();
    }
    void GetCommonDivisor(int value1, int value2) {
        if ((value1 < 0)) {
            GetCommonDivisor = this.GetCommonDivisor(value1, value2);
        }
        else {
            GetCommonDivisor = this.GetCommonDivisor(value2, (value1 % value2));
        }
    }
}
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