static void Main(string[] args)
{
//Task 1
Console.WriteLine("Task 1");
var builder = new StringBuilder();
builder.Append("This is a test");
Console.WriteLine(builder.Substring(10, 4).ToString());
//Task 2
Console.WriteLine();
Console.WriteLine("Task 2");
var list = new List <int> {
1, 2, 3, 4, 5
};
Console.WriteLine(IEnumerableExtensionMethods.Average(list));
Console.WriteLine(IEnumerableExtensionMethods.Sum(list));
Console.WriteLine(IEnumerableExtensionMethods.Product(list));
Console.WriteLine(IEnumerableExtensionMethods.Min(list));
//Task 3
Console.WriteLine();
Console.WriteLine("Task 3");
var listOfStudents = new List <Student> {
new Student("Ivan", "Petrov", "619501", "0285123285", "*****@*****.**", new List <double> {
2, 3, 5, 6, 2, 4, 5
}, new Group(2, "Physics"), 20),
new Student("Gosho", "Kirov", "120125", "0885168754", "*****@*****.**", new List <double> {
3, 3, 3, 3, 3, 5, 3
}, new Group(2, "Mathematics"), 19),
new Student("Pesho", "Pesheff", "748906", "0257231456", "*****@*****.**", new List <double> {
6, 6, 6, 6, 6
}, new Group(2, "Philosophy"), 31),
new Student("Tosho", "Gorgiev", "365406", "6553698523", "*****@*****.**", new List <double> {
2, 2, 2
}, new Group(3, "Mathematics"), 22),
new Student("Hassan", "Mehmedov", "458707", "0251236945", "*****@*****.**", new List <double> {
3, 4, 2, 5, 6, 2, 3
}, new Group(4, "Mathematics"), 19)
};
var studentsWithFirstBeforeLast = from student in listOfStudents
where student.FirstName.CompareTo(student.LastName) < 0
select student;
foreach (var student in studentsWithFirstBeforeLast)
{
Console.WriteLine(student);
}
//Task 4
Console.WriteLine();
Console.WriteLine("Task 4");
var studentsWithAgeInInterval = from student in listOfStudents
where student.Age > 17 && student.Age < 25
select student;
foreach (var student in studentsWithAgeInInterval)
{
Console.WriteLine(student);
}
//Task 5
Console.WriteLine();
Console.WriteLine("Task 5");
var sortedStudents = listOfStudents.OrderBy(student => student.FirstName).ThenBy(student => student.LastName);
foreach (var item in sortedStudents)
{
Console.WriteLine(item);
}
//Task 6
Console.WriteLine();
var numbers = new List <int> {
1, 2, 3, 7, 49, 21, 42, 53, 222, 149
};
Console.WriteLine("With Lambda");
DivisibleBy7And3WithLambda(numbers);
Console.WriteLine("With LINQ");
DivisibleBy7And3WithLINQ(numbers);
//Task 7
Console.WriteLine();
Console.WriteLine("Task 8");
var timer = new Timer(4, 3);
timer.Invoke();
//Task 9
Console.WriteLine();
Console.WriteLine("Task 9");
var studentsFrom2Group = from student in listOfStudents
where student.Group.GroupNumber == 2
orderby student.FirstName
select student;
PrintCollection(studentsFrom2Group.ToList());
//Task 10
Console.WriteLine();
Console.WriteLine("Task 10");
var studentsFrom2 = listOfStudents
.Where(student => student.Group.GroupNumber == 2)
.OrderBy(student => student.FirstName)
.Select(student => student);
PrintCollection(studentsFrom2.ToList());
//Task 11
Console.WriteLine();
Console.WriteLine("Task 11");
var studentsWithABV = from student in listOfStudents
where student.Email.Contains("abv.bg")
select student;
PrintCollection(studentsWithABV.ToList());
//Task 12
Console.WriteLine();
Console.WriteLine("Task 12");
var sofiaMans = listOfStudents
.Where(student => student.Tel.Substring(0, 2) == "02")
.Select(student => student);
PrintCollection(sofiaMans.ToList());
//Task 13
Console.WriteLine();
Console.WriteLine("Task 13");
var excellentStudents = listOfStudents
.Where(student => student.Marks.Contains(6))
.Select(s => new { FullName = string.Format("{0} {1}", s.FirstName, s.LastName), Marks = string.Join(" ", s.Marks.ToArray()) });
PrintCollection(excellentStudents.ToList());
//Taske 14
Console.WriteLine();
Console.WriteLine("Task 14");
var badStudents = listOfStudents
.Where(student => student.Marks.Where(x => x == 2).ToList().Count == 2)
.Select(s => new { FullName = string.Format("{0} {1}", s.FirstName, s.LastName), Marks = string.Join(", ", s.Marks.ToArray()) });
PrintCollection(badStudents.ToList());
//Taskt 15
Console.WriteLine();
Console.WriteLine("Task 15");
var marks = listOfStudents
.Where(student => student.FN.Substring(4, 2) == "06")
.Select(student => student.Marks);
foreach (var item in marks)
{
PrintCollection(item);
Console.WriteLine();
}
//Task 16
Console.WriteLine();
Console.WriteLine("Task 16");
var mathematicians = listOfStudents
.Where(student => student.Group.DepartmentName.Equals("Mathematics"))
.Select(student => student.FirstName);
Console.WriteLine(string.Join(", ", mathematicians));
//Task 17
Console.WriteLine();
Console.WriteLine("Task 17");
var strings = new List <string> {
"I", "am", "a", "baaaad", "string", "array"
};
var longest = strings
.Where(s => s.Length == (strings
.Where(stringa => stringa.Length > 0)
.Select(stringa => stringa.Length).Max()))
.Select(s => s);
PrintCollection(longest.ToList());
//Task 18
Console.WriteLine();
Console.WriteLine("Task 18");
var grouped = listOfStudents
.GroupBy(student => student.Group.GroupNumber)
.Select(student => student);
foreach (var item in grouped)
{
Console.WriteLine("In Group:");
PrintCollection(item.ToList());
Console.WriteLine();
}
}
