static int Main(string[] args)
{
//task 1
Console.WriteLine("Group IS-92\nVlentyn Zahray");
Segments Segment1 = new Segments(2, 1, 4, 3);
Console.WriteLine("Coords of beginning : {0} {1}", Segment1.Get_begin_x_coord(), Segment1.Get_begin_y_coord());
Console.WriteLine("Coords of end: {0} {1}", Segment1.Get_end_x_coord(), Segment1.Get_end_y_coord());
Console.WriteLine("Length of segment : {0:0.00}", Segment1.length());
Console.WriteLine("Angle with axis OX : {0} degrees ", Math.Round((Segment1.Angle_with_oX() * 180) / Math.PI));
// task 2
Strings str = new Strings();
Console.WriteLine("\nTask №2\n");
Console.WriteLine("String before acts :");
char[] string1 = ("Hello, I am Valentyn").ToCharArray();
Big_letters str1 = new Big_letters(string1);
Small_letters str2 = new Small_letters(string1);
Console.WriteLine(string1);
Console.WriteLine("\nString after acts :");
str.Set(("Hello, I am Valentyn").ToCharArray());
str.Add_symbol('!', 6);
str1.Add_symbol('!', 6);
str2.Add_symbol('!', 6);
Console.WriteLine(str.Get());
Console.WriteLine(str1.Get());
Console.WriteLine(str2.Get());
return(0);
}