static void Main(string[] args)
{
/*
1. StringBuilder.Substring
Implement an extension method Substring(int index, int length) for the class StringBuilder that returns new StringBuilder and has the same functionality as Substring in the class String.
*/
Console.WriteLine("\n1. " + new string('-', 76) + "\n");
StringBuilder p = new StringBuilder();
p.Append("Homework: Extension-Methods-Delegates-Lambda-LINQ");
p = p.Substring(9,17);
Console.WriteLine(p.ToString());
/*
2. IEnumerable extensions
Implement a set of extension methods for IEnumerable<T> that implement the following group functions: sum, product, min, max, average.
*/
Console.WriteLine("\n2. " + new string('-', 76) + "\n");
List<int> numbers = new List<int>();
numbers.Add(1);
numbers.Add(1);
numbers.Add(1);
numbers.Add(50);
Console.WriteLine("Sum of the elements : " + numbers.Sum());
Console.WriteLine("Product of the elements: " + numbers.Product());
Console.WriteLine("The min element is: " + numbers.Min());
Console.WriteLine("The max element is: " + numbers.Max());
Console.WriteLine("The average is : " + numbers.Average());
/*
3. First before last
Write a method that from a given array of students finds all students whose first name is before its last name alphabetically.
Use LINQ query operators.
*/
Console.WriteLine("\n3. " + new string('-', 76) + "\n");
var arrWithSudents = new []{
new Student("Dragan", "Petrov"),
new Student("Ivan", "Petrov"),
new Student("Dragan", "Aski"),
new Student("Silvena", "Stanislavova")
};
var firstBeforeLast = Student.FirstBeforeLast(arrWithSudents);
Console.WriteLine("Students that first name is before their's last name alphabeticly:");
foreach(var student in firstBeforeLast)
{
Console.WriteLine(student.FirstName + " " + student.LastName);
}
/*
4. Age range
Write a LINQ query that finds the first name and last name of all students with age between 18 and 24.
*/
Console.WriteLine("\n4. " + new string('-', 76) + "\n");
var arrWithSudentsAndAge = new[]{
new Student("Dragan", "Petrov" , 17),
new Student("Ivan", "Petrov", 21),
new Student("Dragan", "Aski", 23),
new Student("Silvena", "Stanislavova", 24)
};
var ageBetween = Student.AgeRange(arrWithSudentsAndAge);
Console.WriteLine("Students that are beween 18 and 24 years old:");
foreach (var student in ageBetween)
{
Console.WriteLine(student.FirstName + " " + student.LastName);
}
/*
5. Order students
Using the extension methods OrderBy() and ThenBy() with lambda expressions sort the students by first name and last name in descending order.
Rewrite the same with LINQ.
*/
Console.WriteLine("\n5. " + new string('-', 76) + "\n");
var orderStudents = new[]{
new Student("Dragan", "Petrov"),
new Student("Ivan", "Petrov"),
new Student("Dragan", "Aski"),
new Student("Silvena", "Stanislavova")
};
var orderStudentsResult = Student.OrderStudents(orderStudents);
Console.WriteLine("Students ordered by first name then by last name (descending):");
foreach (var student in orderStudentsResult)
{
Console.WriteLine(student.FirstName + " " + student.LastName);
}
/*
6. Divisible by 7 and 3
Write a program that prints from given array of integers all numbers that are
divisible by 7 and 3. Use the built-in extension methods and lambda expressions. Rewrite the same with LINQ.
*/
Console.WriteLine("\n6. " + new string('-', 76) + "\n");
var arr = new int[] { 21, 63, 15, 87, 63, 15, 42 };
var devisibleBy7And3 = DevisibleBy7And3.DevisibleBy7and3(arr);
Console.WriteLine("Numbers devisible by 7 and 3: ");
Console.WriteLine("From: " + string.Join(",",arr));
Console.WriteLine("Result: " + string.Join(",", devisibleBy7And3));
/*
7. Timer
Using delegates write a class Timer that can execute certain method at each t seconds.
*/
Console.WriteLine("\n7. " + new string('-', 76) + "\n");
DelegateTask7 method = new DelegateTask7(Task7Method);
uint seconds = 5;
Console.WriteLine("Wait for {0} {1}. \n", seconds,seconds != 1 ? "seconds" : "second");
Timer newTimer = new Timer(1, method, 5); // -----------------------------------------------------------------
newTimer.StartTimer();
Console.WriteLine();
/*
9. Student groups
Create a class Student with properties FirstName, LastName, FN, Tel, Email, Marks (a List), GroupNumber.
Create a List<Student> with sample students. Select only the students that are from group number 2.
Use LINQ query. Order the students by FirstName.
*/
Console.WriteLine("\n9. " + new string('-', 76) + "\n");
List<Student> studentListTask9 = new List<Student>();
studentListTask9.Add(new Student("Petkan", "Slavchev", null, null, null, null, null, 2));
studentListTask9.Add(new Student("Dragan", "Penchev", null, null, null, null, null, 4));
studentListTask9.Add(new Student("Stamat", "Iordanov", null, null, null, null, null, 1));
studentListTask9.Add(new Student("Katq", "Darinova", null, null, null, null, null, 2));
Console.WriteLine("All students: ");
foreach (var student in studentListTask9)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + student.GroupNumber);
}
var studentsFromGroup2 = Student.SelectFromGroup(studentListTask9, 2);
Console.WriteLine("\nStudents from group 2: ");
foreach(var student in studentsFromGroup2)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + student.GroupNumber);
}
/*
10. Student groups extensions
Implement the previous using the same query expressed with extension methods.
*/
Console.WriteLine("\n10. " + new string('-', 75) + "\n");
var studentsFromGroup2WithExtension = StudentExtensions.SelectFromGroupExtension(studentListTask9, 2);
foreach (var student in studentsFromGroup2WithExtension)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + student.GroupNumber);
}
/*
11. Extract students by email
Extract all students that have email in abv.bg.
Use string methods and LINQ.
*/
Console.WriteLine("\n11. " + new string('-', 75) + "\n");
List<Student> studentsWithEmail = new List<Student>();
studentsWithEmail.Add(new Student("Petkan", "Slavchev", null, null, null, "*****@*****.**", null, 2));
studentsWithEmail.Add(new Student("Dragan", "Penchev", null, null, null, "*****@*****.**", null, 4));
studentsWithEmail.Add(new Student("Stamat", "Iordanov", null, null, null, "*****@*****.**", null, 1));
studentsWithEmail.Add(new Student("Katq", "Darinova", null, null, null, "*****@*****.**", null, 2));
Console.WriteLine("All students: ");
foreach (var student in studentsWithEmail)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + student.Email);
}
Console.WriteLine();
Console.WriteLine("\nStudents with email in abv.bg :");
var studentsWithEmailInAbv = Student.ExtractByEmail(studentsWithEmail, "@abv.bg");
foreach (var student in studentsWithEmailInAbv)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + student.Email);
}
/*
12. Extract students by phone
Extract all students with phones in Sofia.
Use LINQ.
*/
Console.WriteLine("\n12. " + new string('-', 75) + "\n");
List<Student> studentsWithPhone = new List<Student>();
studentsWithPhone.Add(new Student("Petkan", "Slavchev", null, null, "02 15 21 321", "*****@*****.**", null, 2));
studentsWithPhone.Add(new Student("Dragan", "Penchev", null, null, "022 15 21 321", "*****@*****.**", null, 4));
studentsWithPhone.Add(new Student("Stamat", "Iordanov", null, null, "02 15 21 321", "*****@*****.**", null, 1));
studentsWithPhone.Add(new Student("Katq", "Darinova", null, null, "012 15 21 321", "*****@*****.**", null, 2));
Console.WriteLine("All students: ");
foreach (var student in studentsWithPhone)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + student.Tel);
}
Console.WriteLine();
Console.WriteLine("\nStudents with phone in Sofia : ");
var studentsWithPhoneInSofia = Student.ExtractByPhone(studentsWithPhone, "02");
foreach (var student in studentsWithPhoneInSofia)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + student.Tel);
}
/*
13. Extract students by marks
Select all students that have at least one mark Excellent (6) into a new anonymous class that has properties – FullName and Marks.
Use LINQ.
*/
Console.WriteLine("\n13. " + new string('-', 75) + "\n");
List<Student> studentsWithMarks = new List<Student>();
studentsWithMarks.Add(new Student("Petkan", "Slavchev", null, null, "02 15 21 321", "*****@*****.**", new List<double>(new double[] {2,3,4,5}), 2));
studentsWithMarks.Add(new Student("Dragan", "Penchev", null, null, "022 15 21 321", "*****@*****.**", new List<double>(new double[] { 2, 3, 6, 5 }), 4));
studentsWithMarks.Add(new Student("Stamat", "Iordanov", null, null, "02 15 21 321", "*****@*****.**", new List<double>(new double[] { 2, 2, 4, 5 }), 1));
studentsWithMarks.Add(new Student("Katq", "Darinova", null, null, "012 15 21 321", "*****@*****.**", new List<double>(new double[] { 2, 3, 4, 5 }), 2));
Console.WriteLine("All students: ");
foreach (var student in studentsWithMarks)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + string.Join(", ", student.Marks));
}
var result =
from student in studentsWithMarks
where student.Marks.Contains(6)
select new { FullName = student.FirstName + " " + student.LastName, Marks = student.Marks };
Console.WriteLine();
Console.WriteLine("People with excelent mark: ");
foreach (var student in result)
{
Console.WriteLine(student.FullName);
}
/*
14. Extract students with two marks
Write down a similar program that extracts the students with exactly two marks "2".
Use extension methods.
*/
Console.WriteLine("\n14. " + new string('-', 75) + "\n");
List<Student> studentsWith2Marks2 = new List<Student>();
studentsWith2Marks2.Add(new Student("Petkan", "Slavchev", null, null, "02 15 21 321", "*****@*****.**", new List<double>(new double[] { 2, 3, 4, 5 }), 2));
studentsWith2Marks2.Add(new Student("Dragan", "Penchev", null, null, "022 15 21 321", "*****@*****.**", new List<double>(new double[] { 2, 3, 6, 5 }), 4));
studentsWith2Marks2.Add(new Student("Stamat", "Iordanov", null, null, "02 15 21 321", "*****@*****.**", new List<double>(new double[] { 2, 2, 4, 5 }), 1));
studentsWith2Marks2.Add(new Student("Katq", "Darinova", null, null, "012 15 21 321", "*****@*****.**", new List<double>(new double[] { 2, 3, 4, 5 }), 2));
Console.WriteLine("All students: ");
foreach (var student in studentsWith2Marks2)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + string.Join(", ", student.Marks));
}
var studentWit2mark2 = StudentExtensions.StudentsWithTwoMarks(studentsWith2Marks2, 2, 2);
Console.WriteLine();
Console.WriteLine("People with 2 mark 2 : ");
foreach (var student in studentWit2mark2)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + string.Join(", ", student.Marks));
}
/*
15. Extract marks
Extract all Marks of the students that enrolled in 2006. (The students from 2006 have 06 as their 5-th and 6-th digit in the FN).
*/
Console.WriteLine("\n15. " + new string('-', 75) + "\n");
List<Student> studentsMarksYear = new List<Student>();
studentsMarksYear.Add(new Student("Petkan", "Slavchev", null, "110206", "02 15 21 321", "*****@*****.**", new List<double>(new double[] { 2, 3, 4, 5 }), 2));
studentsMarksYear.Add(new Student("Dragan", "Penchev", null, "110202", "022 15 21 321", "*****@*****.**", new List<double>(new double[] { 2, 3, 6, 5 }), 4));
studentsMarksYear.Add(new Student("Stamat", "Iordanov", null, "110221", "02 15 21 321", "*****@*****.**", new List<double>(new double[] { 2, 2, 4, 5 }), 1));
studentsMarksYear.Add(new Student("Katq", "Darinova", null, "110206", "012 15 21 321", "*****@*****.**", new List<double>(new double[] { 2, 3, 4, 5 }), 2));
Console.WriteLine("All students: ");
foreach (var student in studentsMarksYear)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + " " + student.FN.ToString()+ " " + string.Join(", ", student.Marks));
}
var studentMarkYear = Student.MarksOfStudentsYear(studentsMarksYear, 2006);
Console.WriteLine(studentMarkYear);
Console.WriteLine();
Console.WriteLine("Students enrolled in 2006 (their marks) : ");
foreach (var student in studentMarkYear)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + string.Join(", ", student.Marks));
}
/*
17. Longest string
Write a program to return the string with maximum length from an array of strings.
Use LINQ.
*/
Console.WriteLine("\n17. " + new string('-', 75) + "\n");
string[] arrWithStrings = new string[]
{
"pesho", "dragan", "brustakurta", "problem"
};
Console.WriteLine("Arr with strings: \n" + string.Join(", ", arrWithStrings) + "\n");
string longest = arrWithStrings.ReturnLongestString<string>();
Console.WriteLine("The longest string: " + longest);
/*
18. Grouped by GroupNumber
Create a program that extracts all students grouped by GroupNumber and then prints them to the console.
Use LINQ.
*/
Console.WriteLine("\n18. " + new string('-', 75) + "\n");
List<Student> gorupedStudentsByGroup = new List<Student>();
gorupedStudentsByGroup.Add(new Student("Petkan", "Slavchev", null, null, null, null, null, 2));
gorupedStudentsByGroup.Add(new Student("Dragan", "Penchev", null, null, null, null, null, 4));
gorupedStudentsByGroup.Add(new Student("Stamat", "Iordanov", null, null, null, null, null, 1));
gorupedStudentsByGroup.Add(new Student("Katq", "Darinova", null, null, null, null, null, 2));
gorupedStudentsByGroup.Add(new Student("Pencho", "Hristov", null, null, null, null, null, 5));
gorupedStudentsByGroup.Add(new Student("Slaveq", "Pincheva", null, null, null, null, null, 1));
gorupedStudentsByGroup.Add(new Student("Katq", "Darinova", null, null, null, null, null, 2));
Console.WriteLine("All students: ");
foreach (var student in gorupedStudentsByGroup)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + student.GroupNumber);
}
var gorupedStudentsByGroupRslt = Student.OrderStudentsByGroup(gorupedStudentsByGroup);
Console.WriteLine("\nStudents sordet by groups: ");
foreach (var group in gorupedStudentsByGroupRslt)
{
foreach (var student in group)
{
Console.WriteLine("{0} {1} is in group {2}", student.FirstName, student.LastName, student.GroupNumber);
}
}
/*
19. Grouped by GroupName extensions
Rewrite the previous using extension methods
*/
Console.WriteLine("\n19. " + new string('-', 75) + "\n");
gorupedStudentsByGroupRslt = StudentExtensions.GroupName(gorupedStudentsByGroup);
Console.WriteLine("\nStudents sordet by groups: ");
foreach (var group in gorupedStudentsByGroupRslt)
{
foreach (var student in group)
{
Console.WriteLine("{0} {1} is in group {2}", student.FirstName, student.LastName, student.GroupNumber);
}
}
}
static void Main(string[] args)
{
/*
* 1. StringBuilder.Substring
*
* Implement an extension method Substring(int index, int length) for the class StringBuilder that returns new StringBuilder and has the same functionality as Substring in the class String.
*
*/
Console.WriteLine("\n1. " + new string('-', 76) + "\n");
StringBuilder p = new StringBuilder();
p.Append("Homework: Extension-Methods-Delegates-Lambda-LINQ");
p = p.Substring(9, 17);
Console.WriteLine(p.ToString());
/*
* 2. IEnumerable extensions
*
* Implement a set of extension methods for IEnumerable<T> that implement the following group functions: sum, product, min, max, average.
*
*/
Console.WriteLine("\n2. " + new string('-', 76) + "\n");
List <int> numbers = new List <int>();
numbers.Add(1);
numbers.Add(1);
numbers.Add(1);
numbers.Add(50);
Console.WriteLine("Sum of the elements : " + numbers.Sum());
Console.WriteLine("Product of the elements: " + numbers.Product());
Console.WriteLine("The min element is: " + numbers.Min());
Console.WriteLine("The max element is: " + numbers.Max());
Console.WriteLine("The average is : " + numbers.Average());
/*
* 3. First before last
*
* Write a method that from a given array of students finds all students whose first name is before its last name alphabetically.
* Use LINQ query operators.
*
*/
Console.WriteLine("\n3. " + new string('-', 76) + "\n");
var arrWithSudents = new [] {
new Student("Dragan", "Petrov"),
new Student("Ivan", "Petrov"),
new Student("Dragan", "Aski"),
new Student("Silvena", "Stanislavova")
};
var firstBeforeLast = Student.FirstBeforeLast(arrWithSudents);
Console.WriteLine("Students that first name is before their's last name alphabeticly:");
foreach (var student in firstBeforeLast)
{
Console.WriteLine(student.FirstName + " " + student.LastName);
}
/*
* 4. Age range
*
* Write a LINQ query that finds the first name and last name of all students with age between 18 and 24.
*
*/
Console.WriteLine("\n4. " + new string('-', 76) + "\n");
var arrWithSudentsAndAge = new[] {
new Student("Dragan", "Petrov", 17),
new Student("Ivan", "Petrov", 21),
new Student("Dragan", "Aski", 23),
new Student("Silvena", "Stanislavova", 24)
};
var ageBetween = Student.AgeRange(arrWithSudentsAndAge);
Console.WriteLine("Students that are beween 18 and 24 years old:");
foreach (var student in ageBetween)
{
Console.WriteLine(student.FirstName + " " + student.LastName);
}
/*
* 5. Order students
*
* Using the extension methods OrderBy() and ThenBy() with lambda expressions sort the students by first name and last name in descending order.
* Rewrite the same with LINQ.
*
*/
Console.WriteLine("\n5. " + new string('-', 76) + "\n");
var orderStudents = new[] {
new Student("Dragan", "Petrov"),
new Student("Ivan", "Petrov"),
new Student("Dragan", "Aski"),
new Student("Silvena", "Stanislavova")
};
var orderStudentsResult = Student.OrderStudents(orderStudents);
Console.WriteLine("Students ordered by first name then by last name (descending):");
foreach (var student in orderStudentsResult)
{
Console.WriteLine(student.FirstName + " " + student.LastName);
}
/*
* 6. Divisible by 7 and 3
*
* Write a program that prints from given array of integers all numbers that are
* divisible by 7 and 3. Use the built-in extension methods and lambda expressions. Rewrite the same with LINQ.
*
*/
Console.WriteLine("\n6. " + new string('-', 76) + "\n");
var arr = new int[] { 21, 63, 15, 87, 63, 15, 42 };
var devisibleBy7And3 = DevisibleBy7And3.DevisibleBy7and3(arr);
Console.WriteLine("Numbers devisible by 7 and 3: ");
Console.WriteLine("From: " + string.Join(",", arr));
Console.WriteLine("Result: " + string.Join(",", devisibleBy7And3));
/*
* 7. Timer
*
* Using delegates write a class Timer that can execute certain method at each t seconds.
*
*/
Console.WriteLine("\n7. " + new string('-', 76) + "\n");
DelegateTask7 method = new DelegateTask7(Task7Method);
uint seconds = 5;
Console.WriteLine("Wait for {0} {1}. \n", seconds, seconds != 1 ? "seconds" : "second");
Timer newTimer = new Timer(1, method, 5); // -----------------------------------------------------------------
newTimer.StartTimer();
Console.WriteLine();
/*
* 9. Student groups
*
* Create a class Student with properties FirstName, LastName, FN, Tel, Email, Marks (a List), GroupNumber.
* Create a List<Student> with sample students. Select only the students that are from group number 2.
* Use LINQ query. Order the students by FirstName.
*
*/
Console.WriteLine("\n9. " + new string('-', 76) + "\n");
List <Student> studentListTask9 = new List <Student>();
studentListTask9.Add(new Student("Petkan", "Slavchev", null, null, null, null, null, 2));
studentListTask9.Add(new Student("Dragan", "Penchev", null, null, null, null, null, 4));
studentListTask9.Add(new Student("Stamat", "Iordanov", null, null, null, null, null, 1));
studentListTask9.Add(new Student("Katq", "Darinova", null, null, null, null, null, 2));
Console.WriteLine("All students: ");
foreach (var student in studentListTask9)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + student.GroupNumber);
}
var studentsFromGroup2 = Student.SelectFromGroup(studentListTask9, 2);
Console.WriteLine("\nStudents from group 2: ");
foreach (var student in studentsFromGroup2)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + student.GroupNumber);
}
/*
* 10. Student groups extensions
*
* Implement the previous using the same query expressed with extension methods.
*
*/
Console.WriteLine("\n10. " + new string('-', 75) + "\n");
var studentsFromGroup2WithExtension = StudentExtensions.SelectFromGroupExtension(studentListTask9, 2);
foreach (var student in studentsFromGroup2WithExtension)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + student.GroupNumber);
}
/*
* 11. Extract students by email
*
* Extract all students that have email in abv.bg.
* Use string methods and LINQ.
*
*/
Console.WriteLine("\n11. " + new string('-', 75) + "\n");
List <Student> studentsWithEmail = new List <Student>();
studentsWithEmail.Add(new Student("Petkan", "Slavchev", null, null, null, "*****@*****.**", null, 2));
studentsWithEmail.Add(new Student("Dragan", "Penchev", null, null, null, "*****@*****.**", null, 4));
studentsWithEmail.Add(new Student("Stamat", "Iordanov", null, null, null, "*****@*****.**", null, 1));
studentsWithEmail.Add(new Student("Katq", "Darinova", null, null, null, "*****@*****.**", null, 2));
Console.WriteLine("All students: ");
foreach (var student in studentsWithEmail)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + student.Email);
}
Console.WriteLine();
Console.WriteLine("\nStudents with email in abv.bg :");
var studentsWithEmailInAbv = Student.ExtractByEmail(studentsWithEmail, "@abv.bg");
foreach (var student in studentsWithEmailInAbv)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + student.Email);
}
/*
* 12. Extract students by phone
*
* Extract all students with phones in Sofia.
* Use LINQ.
*
*/
Console.WriteLine("\n12. " + new string('-', 75) + "\n");
List <Student> studentsWithPhone = new List <Student>();
studentsWithPhone.Add(new Student("Petkan", "Slavchev", null, null, "02 15 21 321", "*****@*****.**", null, 2));
studentsWithPhone.Add(new Student("Dragan", "Penchev", null, null, "022 15 21 321", "*****@*****.**", null, 4));
studentsWithPhone.Add(new Student("Stamat", "Iordanov", null, null, "02 15 21 321", "*****@*****.**", null, 1));
studentsWithPhone.Add(new Student("Katq", "Darinova", null, null, "012 15 21 321", "*****@*****.**", null, 2));
Console.WriteLine("All students: ");
foreach (var student in studentsWithPhone)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + student.Tel);
}
Console.WriteLine();
Console.WriteLine("\nStudents with phone in Sofia : ");
var studentsWithPhoneInSofia = Student.ExtractByPhone(studentsWithPhone, "02");
foreach (var student in studentsWithPhoneInSofia)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + student.Tel);
}
/*
* 13. Extract students by marks
*
* Select all students that have at least one mark Excellent (6) into a new anonymous class that has properties – FullName and Marks.
* Use LINQ.
*
*/
Console.WriteLine("\n13. " + new string('-', 75) + "\n");
List <Student> studentsWithMarks = new List <Student>();
studentsWithMarks.Add(new Student("Petkan", "Slavchev", null, null, "02 15 21 321", "*****@*****.**", new List <double>(new double[] { 2, 3, 4, 5 }), 2));
studentsWithMarks.Add(new Student("Dragan", "Penchev", null, null, "022 15 21 321", "*****@*****.**", new List <double>(new double[] { 2, 3, 6, 5 }), 4));
studentsWithMarks.Add(new Student("Stamat", "Iordanov", null, null, "02 15 21 321", "*****@*****.**", new List <double>(new double[] { 2, 2, 4, 5 }), 1));
studentsWithMarks.Add(new Student("Katq", "Darinova", null, null, "012 15 21 321", "*****@*****.**", new List <double>(new double[] { 2, 3, 4, 5 }), 2));
Console.WriteLine("All students: ");
foreach (var student in studentsWithMarks)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + string.Join(", ", student.Marks));
}
var result =
from student in studentsWithMarks
where student.Marks.Contains(6)
select new { FullName = student.FirstName + " " + student.LastName, Marks = student.Marks };
Console.WriteLine();
Console.WriteLine("People with excelent mark: ");
foreach (var student in result)
{
Console.WriteLine(student.FullName);
}
/*
* 14. Extract students with two marks
*
* Write down a similar program that extracts the students with exactly two marks "2".
* Use extension methods.
*
*/
Console.WriteLine("\n14. " + new string('-', 75) + "\n");
List <Student> studentsWith2Marks2 = new List <Student>();
studentsWith2Marks2.Add(new Student("Petkan", "Slavchev", null, null, "02 15 21 321", "*****@*****.**", new List <double>(new double[] { 2, 3, 4, 5 }), 2));
studentsWith2Marks2.Add(new Student("Dragan", "Penchev", null, null, "022 15 21 321", "*****@*****.**", new List <double>(new double[] { 2, 3, 6, 5 }), 4));
studentsWith2Marks2.Add(new Student("Stamat", "Iordanov", null, null, "02 15 21 321", "*****@*****.**", new List <double>(new double[] { 2, 2, 4, 5 }), 1));
studentsWith2Marks2.Add(new Student("Katq", "Darinova", null, null, "012 15 21 321", "*****@*****.**", new List <double>(new double[] { 2, 3, 4, 5 }), 2));
Console.WriteLine("All students: ");
foreach (var student in studentsWith2Marks2)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + string.Join(", ", student.Marks));
}
var studentWit2mark2 = StudentExtensions.StudentsWithTwoMarks(studentsWith2Marks2, 2, 2);
Console.WriteLine();
Console.WriteLine("People with 2 mark 2 : ");
foreach (var student in studentWit2mark2)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + string.Join(", ", student.Marks));
}
/*
* 15. Extract marks
*
* Extract all Marks of the students that enrolled in 2006. (The students from 2006 have 06 as their 5-th and 6-th digit in the FN).
*
*/
Console.WriteLine("\n15. " + new string('-', 75) + "\n");
List <Student> studentsMarksYear = new List <Student>();
studentsMarksYear.Add(new Student("Petkan", "Slavchev", null, "110206", "02 15 21 321", "*****@*****.**", new List <double>(new double[] { 2, 3, 4, 5 }), 2));
studentsMarksYear.Add(new Student("Dragan", "Penchev", null, "110202", "022 15 21 321", "*****@*****.**", new List <double>(new double[] { 2, 3, 6, 5 }), 4));
studentsMarksYear.Add(new Student("Stamat", "Iordanov", null, "110221", "02 15 21 321", "*****@*****.**", new List <double>(new double[] { 2, 2, 4, 5 }), 1));
studentsMarksYear.Add(new Student("Katq", "Darinova", null, "110206", "012 15 21 321", "*****@*****.**", new List <double>(new double[] { 2, 3, 4, 5 }), 2));
Console.WriteLine("All students: ");
foreach (var student in studentsMarksYear)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + " " + student.FN.ToString() + " " + string.Join(", ", student.Marks));
}
var studentMarkYear = Student.MarksOfStudentsYear(studentsMarksYear, 2006);
Console.WriteLine(studentMarkYear);
Console.WriteLine();
Console.WriteLine("Students enrolled in 2006 (their marks) : ");
foreach (var student in studentMarkYear)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + string.Join(", ", student.Marks));
}
/*
* 17. Longest string
*
* Write a program to return the string with maximum length from an array of strings.
* Use LINQ.
*
*/
Console.WriteLine("\n17. " + new string('-', 75) + "\n");
string[] arrWithStrings = new string[]
{
"pesho", "dragan", "brustakurta", "problem"
};
Console.WriteLine("Arr with strings: \n" + string.Join(", ", arrWithStrings) + "\n");
string longest = arrWithStrings.ReturnLongestString <string>();
Console.WriteLine("The longest string: " + longest);
/*
* 18. Grouped by GroupNumber
*
* Create a program that extracts all students grouped by GroupNumber and then prints them to the console.
* Use LINQ.
*
*/
Console.WriteLine("\n18. " + new string('-', 75) + "\n");
List <Student> gorupedStudentsByGroup = new List <Student>();
gorupedStudentsByGroup.Add(new Student("Petkan", "Slavchev", null, null, null, null, null, 2));
gorupedStudentsByGroup.Add(new Student("Dragan", "Penchev", null, null, null, null, null, 4));
gorupedStudentsByGroup.Add(new Student("Stamat", "Iordanov", null, null, null, null, null, 1));
gorupedStudentsByGroup.Add(new Student("Katq", "Darinova", null, null, null, null, null, 2));
gorupedStudentsByGroup.Add(new Student("Pencho", "Hristov", null, null, null, null, null, 5));
gorupedStudentsByGroup.Add(new Student("Slaveq", "Pincheva", null, null, null, null, null, 1));
gorupedStudentsByGroup.Add(new Student("Katq", "Darinova", null, null, null, null, null, 2));
Console.WriteLine("All students: ");
foreach (var student in gorupedStudentsByGroup)
{
Console.WriteLine(student.FirstName + " " + student.LastName + " " + student.GroupNumber);
}
var gorupedStudentsByGroupRslt = Student.OrderStudentsByGroup(gorupedStudentsByGroup);
Console.WriteLine("\nStudents sordet by groups: ");
foreach (var group in gorupedStudentsByGroupRslt)
{
foreach (var student in group)
{
Console.WriteLine("{0} {1} is in group {2}", student.FirstName, student.LastName, student.GroupNumber);
}
}
/*
* 19. Grouped by GroupName extensions
*
* Rewrite the previous using extension methods
*
*/
Console.WriteLine("\n19. " + new string('-', 75) + "\n");
gorupedStudentsByGroupRslt = StudentExtensions.GroupName(gorupedStudentsByGroup);
Console.WriteLine("\nStudents sordet by groups: ");
foreach (var group in gorupedStudentsByGroupRslt)
{
foreach (var student in group)
{
Console.WriteLine("{0} {1} is in group {2}", student.FirstName, student.LastName, student.GroupNumber);
}
}
}
