Question

How to convert part of a string between two indexes to lowercase in C#

Answer 1

using System;
using System.Text;
 
class Program
{
    static string convert_part_to_lowercase(string s, int from_idx, int to_idx) { 
        int len = s.Length; 
  
        if (from_idx < 0 || to_idx > len) return s;
  
        StringBuilder sb = new StringBuilder(s);
        
        for (int i = 0; i < len; i++) {
             if ((i >= from_idx && i <= to_idx) && (s[i] >= 'A' && s[i] <= 'Z')) {
                 sb[i] = Char.ToLower(sb[i]);
             }
        }
        return sb.ToString();
    } 
    
    static void Main() {
        string s = "CSHARP PROGRAMMING"; 
  
        s = convert_part_to_lowercase(s, 3, 6);
        Console.WriteLine(s);
        
        s = convert_part_to_lowercase(s, 11, 12);
        Console.WriteLine(s);
    }
}
 
 
 
 
/*
run:
 
CSHarp PROGRAMMING
CSHarp PROGraMMING
 
*/

 

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