Question

How to find all repeating characters in a string with C#

Answer 1

using System;
 
class Program
{
    public static char PrintAllRepeatingCharacters(string str) {  
        int[] occurrences = new int[256];  
        
        for (int i = 0; i < str.Length; i++) {  
            occurrences[str[i]]++;  
        }  
         
        for (int i = 0; i < str.Length; i++) {   
            if (occurrences[str[i]] > 1) {  
                Console.WriteLine(str[i]);  
                occurrences[str[i]] = -1;
            }  
        }  
        
        return ' ';
    }  
    static void Main() {
        string str = "java c c++ csharp php python";
 
        PrintAllRepeatingCharacters(str);
    }
}
 
 
 
 
/*
run:
 
a
 
c
+
h
p
 
*/

 

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