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Afisarea caracterelor c#


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Buna am un problema pe care nu stiu cum s-o rezolva

Trebuie sa fac un program care sa afiseze prima ultima si cea din mijloc litera a unui sir de caractere

    class Program
        static void Main(string[] args)
            Console.WriteLine("Introduceti sirul de caractere"); 
            string s1 = Console.ReadLine(); 

            Console.WriteLine("\nPrima litera :");
           Console.WriteLine("\nLitera din mijloc : ");

            Console.WriteLine("\nUltima litera :");
            Console.WriteLine(s1[s1.Length - 1]);

Prima si ultima am reusit sa aflu dar pe cea din mijloc nu stiu cum.
Ma puteti ajuta va rog?

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Pai te folosesti de caracterul din mijloc impartind lungimea sirului la 2. Poti lua cateva cazuri concrete sa vezi ce si cum. Dar aici depinde cum vrei sa tratezi sirurile care au numar par de caractere.

Daca are un numar impar de caractere, gen abcde si vrei sa afisezi c, lungimea e 5, se afla pe pozitia 2, deci e suficient sa afisezi sir[sir.Length / 2]

La numar par de caractere, metoda gen sirul abcd, metoda de mai sus iti fa afisa caracterul c. Aici depinde daca vrei sa afisezi b sau c. (sau ambele :) ..  sau niciunul :)))

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