Question

How to print characters that have even frequencies of occurrence in a string with C#

Answer 1

using System;

class Program
{
    static void print_even_frequencies_char(string s) { 
        int[] letters = new int[256];
          
        for (int i = 0; i < s.Length; i++) {
             if (Char.IsLetter(s[i])) {
                 letters[(int)s[i]]++;
             }
        }
           
        for (int i = 0; i < 256; i++) { 
            if (letters[i] != 0 && letters[i] % 2 == 0) {
                Console.WriteLine((char)i + " " + letters[i]);
            }
        } 
    } 
    static void Main() {
        string s = "c# programming pro oo"; 
          
        print_even_frequencies_char(s);
    }
}


/*
run:

g 2
m 2
o 4
p 2

*/

 

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