Shalini_CSG_CodeTest, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Write a program to count occurrence of each character in the string
            //use question as given string 
            //Builtin array functions and LINQ are not allowed.
            
            Console.WriteLine("Start here...");
             string inputString = "Write a program to count occurence of each character in the string";

while (inputString.Length > 0)
            {
                int count = 0;

for (int i = 0; i < inputString.Length; i++)
                {
                    if (inputString[0] == inputString[i])
                    {
                        count++;
                    }
                }

Console.WriteLine("count of" + " " + inputString[0] + "=" + count);

inputString = inputString.Replace(inputString[0].ToString(), string.Empty);
            }

Console.ReadLine();
            
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,25 sec, absolute running time: 10 sec, cpu time: 0,09 sec, average memory usage: 25 Mb, average nr of threads: 5, absolute service time: 10,25 sec