static void Main()
{
Student[] test = new Student[5];
test[0] = new Student("Ivan", "Petrov", 18);
test[1] = new Student("Georgi", "Asenov", 22);
test[2] = new Student("Georgi", "Georgiev", 31);
test[3] = new Student("Angel", "Kostov", 19);
test[4] = new Student("Valeri", "Vasilev", 27);
Student[] alphabeticalFilter = AlphabeticalArrange(test);
Console.WriteLine("Students, filtered by first name before last name alphabetically: ");
Console.WriteLine(new string('-', 65));
Print(alphabeticalFilter);
Console.WriteLine();
Student[] ageFilter = AgeArrange(test);
Console.WriteLine("Students, filtered by Age: ");
Console.WriteLine(new string('-', 65));
Print(ageFilter);
Console.WriteLine();
Student[] descendingOrderFilter = DescendingOrder(test);
Console.WriteLine("Students, filtered by first and last name in descending order: ");
Console.WriteLine(new string('-', 65));
Print(descendingOrderFilter);
}
public static void Print(Student[] input)
{
for (int i = 0; i < input.Length; i++)
{
Console.WriteLine("Full name: {0}", input[i].FirstName + " " + input[i].LastName);
Console.WriteLine("Age: {0}", input[i].Age);
Console.WriteLine();
}
}
// Problem 5. Order students
public static Student[] DescendingOrder(Student[] input)
{
// var result = input.OrderByDescending(first => first.FirstName).ThenByDescending(last => last.LastName);
var result =
from st in input
orderby st.FirstName descending, st.LastName descending
select st;
return result.ToArray();
}
// Problem 3. First before last
public static Student[] AlphabeticalArrange(Student[] input)
{
//var result = input.Where(x => x.FirstName.CompareTo(x.LastName) < 0);
var result =
from st in input
where st.FirstName.CompareTo(st.LastName) < 0
orderby st.FirstName
select st;
return result.ToArray();
}
// Problem 4. Age range
public static Student[] AgeArrange(Student[] input)
{
//var result = input.Where(st => st.Age >= 18 && st.Age <= 24);
var result =
from st in input
where st.Age >= 18 && st.Age <= 24
orderby st.Age
select st;
return result.ToArray();
}
