loop example

-------------- using foreach loop
using System;
                             
public class Program
{
      public static void Main()
      {
           
            char charCout = 'o'; 
        int Count = 0;
            string  strFirst =  "Hello World";
             foreach(char chr in strFirst) { 
            if (chr == charCout) { 
                Count++; 
            } 
        }
                 
            Console.WriteLine(Count);
      }
}


----------------using for loop
using System;
                             
public class Program
{
      public static void Main()
      {
           
            char charCout = 'o'; 
        int Count = 0;
            string  strFirst =  "Hello World";
            char[]  a = strFirst.ToCharArray();
            for(int i = 0 ; i< a.Length ; i ++)
            {
                  if(a[i] == 'o')
                  {
                         Count = Count + 1;
                  }
            }
                 
            Console.WriteLine(Count);
      }
}

------------------------USING REVERSE ARRAY

using System;
                             
public class Program
{
      public static void Main()
      {
           
            char charCout = 'o'; 
        int Count = 0;
            string  strFirst =  "Hello World";
            string s = "";
            char[]  a = strFirst.ToCharArray();
            for(int  i= a.Length -1 ; i>=0  ; i --)
            {
                 
                         s = s + a[i].ToString();
                 
            }
                 
            Console.WriteLine(s);
      }
}

--------------count string

using System;
                             
public class Program
{
      public static void Main()
      {
           
            char charCout = 'o'; 
        int Count = 0;
            string  strFirst =  "Hello World";
            string s = "";
            char[]  a = strFirst.ToCharArray();
            for(int  i= 0 ; i < a.Length  ; i ++)
            {
                 
                         Count = Count + 1;
                 
            }
                 
            Console.WriteLine(Count);
      }

}

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