static Studant GetStudant(List <Studant> studants, string firstname, string lastName)
{
Studant existingStudant = null;
foreach (var studant in studants)
{
if (studant.FirstName == firstname && studant.LastName == lastName)
{
existingStudant = studant;
}
}
return(existingStudant);
}
static void Main()
{
List <Studant> studants = new List <Studant>();
string line = Console.ReadLine();
while (line != "end")
{
string[] tokens = line.Split();
string firstName = tokens[0];
string lastName = tokens[1];
int age = int.Parse(tokens[2]);
string city = tokens[3];
if (isStudentExisting(studants, firstName, lastName))
{
Studant studant = GetStudant(studants, firstName, lastName);
studant.FirstName = firstName;
studant.LastName = lastName;
studant.age = age;
studant.city = city;
}
else
{
Studant studant = new Studant()
{
FirstName = firstName,
LastName = lastName,
age = age,
city = city
};
studants.Add(studant);
}
line = Console.ReadLine();
}
string filterCity = Console.ReadLine();
foreach (var studant in studants)
{
if (studant.city == filterCity)
{
Console.WriteLine($"{studant.FirstName} " +
$"{studant.LastName} " +
$"is {studant.age} years old.");
}
}
}
