Question

How to convert a string lowercase characters to uppercase and uppercase to lowercase with C#

Answer 1

using System;
using System.Text;

class Program
{
    static string flip_characters(string s) { 
        int len = s.Length; 
 
        StringBuilder sb = new StringBuilder(s);
        
        for (int i = 0; i < len; i++) { 
             if (sb[i] >= 'A' && sb[i] <= 'Z') 
                 sb[i] = Char.ToLower(sb[i]);
             else 
                if (sb[i] >= 'a' && sb[i] <= 'z') 
                    sb[i] = Char.ToUpper(sb[i]);
        } 
   
        return sb.ToString();
    } 
    static void Main() {
        string s = "cShaRP pRograMMinG"; 
 
        s = flip_characters(s);

        Console.Write(s);
    }
}



/*
run:

CsHArp PrOGRAmmINg

*/

 

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Answer 2

using System;
using System.Text;
 
class Program
{
    static string flip_characters(string s) { 
        int len = s.Length; 
  
        StringBuilder sb = new StringBuilder(s);
        
        for (int i = 0; i < len; i++) { 
             if ((sb[i] >= 65 && sb[i] <= 90) || (sb[i] >= 97 && sb[i] <= 122)) {
                  sb[i] = (char)(ch ^ 32);
            }
        } 
    
        return sb.ToString();
    } 
    static void Main() {
        string s = "cShaRP pRograMMinG"; 
  
        s = flip_characters(s);
 
        Console.Write(s);
    }
}
 
 
 
/*
run:
 
CsHArp PrOGRAmmINg
 
*/

 

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