Question

How to convert char in a string to lowercase by index with C#

Answer 1

using System;
using System.Text;
 
class Program
{
    static string string_char_tolower(string s, int idx) { 
        int len = s.Length; 
  
        if (idx > len || idx < 0) return s;
  
        StringBuilder sb = new StringBuilder(s);
         
        sb[idx] = Char.ToLower(sb[idx]);
         
        return sb.ToString();
    } 
    static void Main() {
        string s = "C# PROGRAMMING"; 
  
        s = string_char_tolower(s, 3);
 
        Console.Write(s);
    }
}
 
 
 
 
/*
run:
 
C# pROGRAMMING
 
*/

 

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