public static void Main()
{
string message = "Hello!";
char[] substring = Operations.Subsequence(message.ToCharArray(), 2, 3);
Console.WriteLine(substring);
int[] array = new int[] { -1, 3, 2, 1 };
int[] subArray = Operations.Subsequence(array, 0, 2);
Console.WriteLine(string.Join(" ", subArray));
int[] fullArray = Operations.Subsequence(array, 0, 4);
Console.WriteLine(string.Join(" ", fullArray));
int[] emptyArray = Operations.Subsequence(array, 0, 0);
Console.WriteLine(string.Join(" ", emptyArray));
Console.WriteLine(Operations.ExtractEnding("I love C#", 2));
Console.WriteLine(Operations.ExtractEnding("Nakov", 4));
Console.WriteLine(Operations.ExtractEnding("beer", 4));
// Console.WriteLine(Operations.ExtractEnding("Hi", 100));
Console.WriteLine(Operations.CheckPrime(23));
Console.WriteLine(Operations.CheckPrime(33));
List<Exam> peterExams = new List<Exam>()
{
new SimpleMathExam(2),
new CSharpExam(55),
new CSharpExam(100),
new SimpleMathExam(1),
new CSharpExam(0),
};
Student peter = new Student("Peter", "Petrov", peterExams);
double peterAverageResult = peter.CalcAverageExamResultInPercents();
Console.WriteLine("Average results = {0:p0}", peterAverageResult);
}
