public static void Main()
else if(a == 0 && b == 0){
remainder = a - (sum * b);
Console.WriteLine("{0} / {1} = {2} ({3})", a, b, sum, remainder);
remainder = b - (sum * a);
Console.WriteLine("{0} / {1} = {2} ({3})", b, a, sum, remainder);
Console.WriteLine("GCD = {0}", gcd);