using System;

class myString {

	public String str;

	public myString (char[] strValue) {
		str = new String(strValue);
		Console.WriteLine("The string \'" + str + "\' has been initialised by passing an array of characters");		
	}
	
	public myString (char strValue,int intCount) {
		str = new String(strValue,intCount);
		Console.WriteLine("The string \'" + str + "\' has been initialised by a character \'" + strValue + "\' which is repeated \'" + intCount + "\' times");
	}
	
	public myString (char[] strValue,int intStart,int intEnd) {
		str = new String(strValue,intStart,intEnd);
		Console.WriteLine("The string "+ str + " has been initialised by array of characters starting from \'"+intStart+"\' and ending at \'"+intEnd+"\'");
	}
}


public class clsString {
	char[] chArray; //={\'c\',\'h\',\'a\',\'r\',\'a\',\'c\',\'t\',\'e\',\'r\',\' \',\'a\',\'r\',\'r\',\'a\',\'y\'};
	int intChoice;
	myString objString;
		
	public static void Main() {
		clsString obj = new clsString();
		obj.init();		
	}

	private void init() {
		Console.WriteLine("1. Create the string through character Array");
		Console.WriteLine("2. Create the string through a single character which is repeated a number of times");
		Console.WriteLine("3. Create the string through character array specifying the starting and ending places");
		Console.WriteLine("4. To exit");
		Console.Write("Enter Your Choice : " );
		string strTemp=Console.ReadLine();
		intChoice=int.Parse(strTemp);
		try {
			switch (intChoice) {
			case 1:
				mtdCharacterArray();
				break;
			case 2:
				mtdRepetions();
				break;
			case 3:
				mtdChArrayStEnd();
				break;
			default:
				Console.WriteLine("default");
				Environment.Exit(0);
				break;
			}
			mtdMethods();
			init();
		}
		catch (Exception e) {
			Console.WriteLine("error occured at :" + e.StackTrace);
		}

	}
	
	private void mtdCharacterArray() {
		chArray=mtdGetChArray();	
		objString = new myString(chArray);
	}
	
	private char[] mtdGetChArray() {
		char[] chTempArray = new char[Char.MaxValue];
		string strTemp;
		
		Console.Write("Enter the character(s) : ");
		strTemp=Console.ReadLine();
		chTempArray=strTemp.ToCharArray();
		
		return chTempArray;
	}
	
	private void mtdRepetions() {
		Console.Write("Give the number of Repetions : ");
		string strTmp=Console.ReadLine();
		int intTemp=int.Parse(strTmp);
		chArray=mtdGetChArray();
		objString = new myString(chArray[0],intTemp);		
	}
	
	private void mtdChArrayStEnd() {
		string strTmp;
		Console.Write("Give the starting position :");
		strTmp=Console.ReadLine();
		int intStart=int.Parse(strTmp);
		Console.Write("Give the ending position : ");
		strTmp=Console.ReadLine();		
		int intEnd=int.Parse(strTmp);
		chArray=mtdGetChArray();
		objString = new myString(chArray,intStart,intEnd);
	}
	private void mtdMethods() {
		Console.WriteLine("");
		Console.WriteLine("1.  Concatenate strings ");
		Console.WriteLine("2.  Copy of a String into an existing one.");
		Console.WriteLine("3.  Create a new string out of the charecters in the original one");
		Console.WriteLine("4.  Check if the string ends with a particular set of characters");
		Console.WriteLine("5.  Formating the string");
		Console.WriteLine("6.  Hash code of the string");
		Console.WriteLine("7.  Index of first occurence of any string within another string");
		Console.WriteLine("8.  Index of first occurence of any character in the given string");
		Console.WriteLine("9.  Insert a string at a specified place");
		Console.WriteLine("10. Join the strings with a seperator");
		Console.WriteLine("11. Index of last occurence of any string within another string");
		Console.WriteLine("12. Index of last occurence of any character in the given string");
		Console.WriteLine("13. Length of the string");
		Console.WriteLine("14. Pad required number of spaces or any other character to the left of the string");
		Console.WriteLine("15. Pad required number of spaces or any other character to the right of the string");
		Console.WriteLine("16. Remove some characters from a specified location");
		Console.WriteLine("17. Replaces all occurences of a specified string in another string");
		Console.WriteLine("18. Split the string depending on a delimiter");
		Console.WriteLine("19. Check if the string starts with a particular \'string\'");
		Console.WriteLine("20. Retrieve a substring");
		Console.WriteLine("21. Get the string in lower case");
		Console.WriteLine("22. Get the string in UPPER case");
		Console.WriteLine("23. Trim the String");
		Console.WriteLine("24. Trim the end of the string");
		Console.WriteLine("25. Trim the start of the string");
		Console.WriteLine("26. Exit the program");
		Console.WriteLine("");
		Console.Write("What do u want to do now : " );
		string strMtd=Console.ReadLine();
		Console.WriteLine("");
		try {
			int intSwitch=int.Parse(strMtd);

			switch (intSwitch) {
				case 1:
					mtdConcatenate();
					break;
				case 2:
					mtdCopy();
					break;
				case 3:
					mtdCopyTo();
					break;
				case 4:
					mtdEndsWith();
					break;
				case 5:
					mtdFormat();
					break;
				case 6:
					mtdHash();
					break;
				case 7:
					mtdIndexOf();
					break;
				case 8:
					mtdIndexOfAny();
					break;
				case 9:
					mtdInsert();
					break;
				case 10:
					mtdJoin();
					break;
				case 11:
					mtdLastIndex();
					break;
				case 12:
					mtdLastIndexAny();
					break;
				case 13:
					mtdLength();
					break;
				case 14:
					mtdPadLeft();
					break;
				case 15:
					mtdPadRight();
					break;
				case 16:
					mtdRemove();
					break;
				case 17:
					mtdReplace();
					break;
				case 18:
					mtdSplit();
					break;
				case 19:
					mtdStartsWith();
					break;
				case 20:
					mtdSubStr();
					break;
				case 21:
					mtdLower();
					break;
				case 22:
					mtdUpper();
					break;
				case 23:
					mtdTrim();
					break;
				case 24:
					mtdTrimEnd();
					break;
				case 25:
					mtdTrimStart();
					break;
				case 26:
					Environment.Exit(0);
					break;
				default:
					Console.WriteLine("Wake up !!!! . Select a correct choice");
					break;
			}
			mtdMethods();
		}
		catch (Exception e){
			Console.WriteLine("Error : " + e.Message);
			Console.WriteLine("Source: " + e.StackTrace);
			Environment.Exit(0);
		}
	}
	
	private void mtdConcatenate() {
		string[] strTempArr=new String[10];
		

		Console.WriteLine("String.Concat()  - >  this concatenates strings together.There are 4 implementations");
		Console.WriteLine("1. String.Concat(String[]) -> concatenates the string array");
		Console.WriteLine("2. String.Concat(String,String) -> concatenates the two strings");
		Console.WriteLine("3. String.Concat(String,String,String) -> concatenates the three strings ");
		Console.WriteLine("4. String.Concat(String,String,String,String) -> concatenates the four strings ");
		
		Console.Write("Enter the string array length : ");
		string strArr=Console.ReadLine();
		int intArr=int.Parse(strArr);
		for (int i=0;i<intArr;i++) {
			Console.Write("Enter string " + i + " : ");
			strTempArr[i]=Console.ReadLine();
		}
			
		Console.WriteLine("the Concatenated string : " + String.Concat(strTempArr));
		Console.WriteLine("the concatenation of the first two string : " + String.Concat(strTempArr[0],strTempArr[1]));
		Console.WriteLine("the concatenation of the first three string : " + String.Concat(strTempArr[0],strTempArr[1],strTempArr[2]));
		Console.WriteLine("the concatenation of the first four string : " + String.Concat(strTempArr[0],strTempArr[1],strTempArr[2],strTempArr[3]));	
	}
	
	private void mtdCopy() {
		Console.WriteLine("String.Copy(String str)  - > returns a new string with the same value as \'str\'");
		Console.WriteLine("original string : " + objString.str);
		Console.Write("enter the string to replace the above one : ");
		string strCopy=Console.ReadLine();
		objString.str=String.Copy(strCopy);
		Console.WriteLine("the string after copying : " + objString.str);
	}
	
	private void mtdCopyTo() {
		Console.WriteLine("String.CopyTo(int srcIndex,char[] dest,int destIndex,int intCount)  - > copies a part of string to another string");
		Console.WriteLine("srcIndex -> the start index in the original string from where u want the copy");
		Console.WriteLine("dest -> the destination chracter array");
		Console.WriteLine("destIndex -> the start index in the destination array to which the characters should be copied");
		Console.WriteLine("dest -> the length of characters in the original string to be copied");
		Console.WriteLine("Destination string is : " + objString.str);
		Console.Write("Enter the source string : ");
		string strTmp=Console.ReadLine();
		Console.Write("Enter the starting index for source string : ");
		string strSrcSt=Console.ReadLine();
		int intSrcSt=int.Parse(strSrcSt);
		Console.Write("Enter the starting index in the destination string : ");
		string strDstSt=Console.ReadLine();
		int intDstSt=int.Parse(strDstSt);
		Console.Write("Enter the number of characters to be copied from the source string : ");
		string strSrcLn=Console.ReadLine();
		int intSrcLn=int.Parse(strSrcLn);
		chArray=objString.str.ToCharArray();
		strTmp.CopyTo(intSrcSt,chArray,intDstSt,intSrcLn);
		objString.str=new String(chArray);
		Console.WriteLine("The changed string is : " + objString.str);
	}
	
	private void mtdEndsWith() {
		Console.WriteLine("String.EndsWith(String str)  - >  this function returns a boolen value, checking whether the parent string ends with \'str\'");
		Console.WriteLine("The string to be checked :" + objString.str);
		Console.Write("Enter the \'ends with\' string :");
		String strTmp = Console.ReadLine();
		if (objString.str.EndsWith(strTmp)) 
			Console.WriteLine("\'"+ objString.str + "\' ends with \'" + strTmp + "\'.");
		else
			Console.WriteLine("\'" + objString.str + "\' does not end with \'" + strTmp + "\'.");
	}
	
	private void mtdFormat() {
		Console.WriteLine("String.Format()  - > this static function helps in formating the strings");
		Console.WriteLine("Format(String str,Object obj)  -> format the string with one object");
		Console.WriteLine("Format(String str,Object obj1,Object obj2)  -> format the string with two objects");
		Console.WriteLine("Formating the string with three objects is another implementation.");
		Console.WriteLine("The string should follow the formating specification  - > {N,[M]:[formatstring]}");
		Console.WriteLine("N -> indicates the argument to be replaced. starts from zero(0)");
		Console.WriteLine("M -> indicates the length of formatting area,padded with spaces if the value filled in is smaller.");
		Console.WriteLine("if the value is -ve then value is left justified, if value is +ve then value is right justified.");
		Console.WriteLine("formatstring -> these are values of formating codes (eg : \'C\' is used for currency)");
		String strTmp="it is {0} working in {1,10} bcos i get {2,5:C} per month.it is not {0} working {1,-10} bcos i get only {2,-5:C}";
		Console.WriteLine("The source string is : " + strTmp);
		Console.Write("Enter the first replacement string : ");
		String strTmp1=Console.ReadLine();
		Console.Write("Enter the second replacement string : ");
		String strTmp2=Console.ReadLine();
		Console.Write("Enter a numeral : ");
		String strTmp3=Console.ReadLine();
		int intTmp=int.Parse(strTmp3);
		Console.WriteLine("the modified string :" + String.Format(strTmp,strTmp1,strTmp2,intTmp));
	}
	
	private void mtdHash() {
		Console.WriteLine("String.GetHashCode()  - > this fuctions returns the hash code of the string");
		Console.WriteLine("Hash of \'"+ objString.str + "\' is : " + objString.str.GetHashCode());
	}
	
	private void mtdIndexOf() {
		Console.WriteLine("String.IndexOf()  - > this returns the index of the first occurence of a charcter or string in the given string.");
		Console.WriteLine("The search of the string stops when the required value is founds or proceedes until the end of the string has been reached");
		Console.WriteLine("It returns the index if the value is found or \'-1\' if not found.");
		mtdIndexImpl("Index","first");
	}
	
	private void mtdIndexImpl(String strValue,String strFL) {
		string strChar;
		char c;
		int intStart;
		int intCount;
		Console.WriteLine("1. String."+strValue+"Of(char c)  -> returns the "+strFL+" occurence \'c\' in the string");
		Console.WriteLine("2. String."+strValue+"Of(string str) -> returns the "+strFL+" occurence of \'str\' in the string");
		Console.WriteLine("3. String."+strValue+"Of(char c,int i) -> returns the "+strFL+" occurence of \'c\' in the string, the search starts from \'i\'");
		Console.WriteLine("4. String."+strValue+"Of(string str,int i) -> returns the "+strFL+" occurence of \'str\' in the string, the search starts from \'i\'");
		Console.WriteLine("5. String."+strValue+"Of(char c,int i,int j) -> returns the "+strFL+" occurence of \'c\' in the string, the search starting from \'i\' and examining \'j\' character positions.");
		Console.WriteLine("6. String."+strValue+"Of(string str,int i,int j) -> returns the "+strFL+" occurence of \'str\' in the string, the search starting from \'i\' and examining \'j\' character positions.");
		Console.WriteLine("7. Finished with "+strValue+"Of.");
		Console.Write("Give the choice :");
		String strTmp=Console.ReadLine();
		int intChoice=int.Parse(strTmp);
		bool blnStay=true;
		Console.WriteLine("The Source string is :"+objString.str);
		switch (intChoice) {
			case 1:	
				Console.Write("Enter the character :");
				strChar=Console.ReadLine();
				c=(strChar.ToCharArray())[0];
				if ("first"==strFL)
					Console.WriteLine("The index of \'"+c+"\' in \'"+objString.str+"\' is : "+objString.str.IndexOf(c));
				else
					Console.WriteLine("The index of \'"+c+"\' in \'"+objString.str+"\' is : "+objString.str.LastIndexOf(c));
				break;
			case 2:
				Console.Write("Enter the string :");
				strChar=Console.ReadLine();
				if ("first"==strFL)
					Console.WriteLine("The index of \'"+strChar+"\' in \'"+objString.str+"\' is : "+objString.str.IndexOf(strChar));
				else
					Console.WriteLine("The index of \'"+strChar+"\' in \'"+objString.str+"\' is : "+objString.str.LastIndexOf(strChar));
				break;
			case 3:
				Console.Write("Enter the character :");
				strChar=Console.ReadLine();
				c=(strChar.ToCharArray())[0];
				Console.Write("Enter the starting Index :");
				intStart=int.Parse(Console.ReadLine());
				if ("first"==strFL)
					Console.WriteLine("The index of \'"+c+"\' in \'"+objString.str+"\' is : "+objString.str.IndexOf(c,intStart));
				else
					Console.WriteLine("The index of \'"+c+"\' in \'"+objString.str+"\' is : "+objString.str.LastIndexOf(c,intStart));
				break;
			case 4:
				Console.Write("Enter the string :");
				strChar=Console.ReadLine();
				Console.Write("Enter the starting Index :");
				intStart=int.Parse(Console.ReadLine());
				if ("first"==strFL)
					Console.WriteLine("The index of \'"+strChar+"\' in \'"+objString.str+"\' is : "+objString.str.IndexOf(strChar,intStart));
				else
					Console.WriteLine("The index of \'"+strChar+"\' in \'"+objString.str+"\' is : "+objString.str.LastIndexOf(strChar,intStart));
				break;
			case 5:
				Console.Write("Enter the character :");
				strChar=Console.ReadLine();
				c=(strChar.ToCharArray())[0];
				Console.Write("Enter the starting Index :");
				intStart=int.Parse(Console.ReadLine());
				Console.Write("Enter the number of characters to search : ");
				intCount=int.Parse(Console.ReadLine());
				if ("first"==strFL)
					Console.WriteLine("The index of \'"+c+"\' in \'"+objString.str+"\' is : "+objString.str.IndexOf(c,intStart,intCount));
				else
					Console.WriteLine("The index of \'"+c+"\' in \'"+objString.str+"\' is : "+objString.str.LastIndexOf(c,intStart,intCount));
				break;
			case 6:
				Console.Write("Enter the character :");
				strChar=Console.ReadLine();
				Console.Write("Enter the starting Index :");
				intStart=int.Parse(Console.ReadLine());
				Console.Write("Enter the number of characters to search : ");
				intCount=int.Parse(Console.ReadLine());
				if ("first"==strFL)
					Console.WriteLine("The index of \'"+strChar+"\' in \'"+objString.str+"\' is : "+objString.str.IndexOf(strChar,intStart,intCount));
				else
					Console.WriteLine("The index of \'"+strChar+"\' in \'"+objString.str+"\' is : "+objString.str.LastIndexOf(strChar,intStart,intCount));
				break;
			case 7:
				blnStay=false;
				break;
		}
		if (blnStay)
			mtdIndexImpl(strValue,strFL);
	}
	
	private void mtdIndexOfAny() {
		Console.WriteLine("String.IndexOfAny()  - > this returns the index of the first occurence of any charcter of the character array in the given string.");
		Console.WriteLine("The search of the string stops when the required value is founds or proceedes until the end of the string has been reached");
		Console.WriteLine("It returns the index if the value is found or \'-1\' if not found.");
		mtdIndexAnyImpl("Index","first");
	}
	
	private void mtdIndexAnyImpl(String strValue,String strFL) {
		string strChar;
		char[] c=new char[char.MaxValue];
		int intStart;
		int intCount;
		Console.WriteLine("1. String."+strValue+"OfAny(char[] c)  -> returns the "+strFL+" occurence of any character of the array in the string");
		Console.WriteLine("2. String."+strValue+"OfAny(char[] c,int i) -> returns the "+strFL+" occurence of any character of the array in the string, the search starts from \'i\'");
		Console.WriteLine("3. String."+strValue+"Of(char[] c,int i,int j) -> returns the "+strFL+" occurence of any character of the array in the string, the search starting from \'i\' and examining \'j\' character positions.");
		Console.WriteLine("4. Finished with "+strValue+"OfAny.");
		Console.Write("Give the choice :");
		String strTmp=Console.ReadLine();
		int intChoice=int.Parse(strTmp);
		bool blnStay=true;
		Console.WriteLine("The source string is : "+objString.str );
		switch (intChoice) {
			case 1:
				Console.Write("Enter the string for the character array :");
				strChar=Console.ReadLine();
				c=strChar.ToCharArray();
				if ("first"==strFL)
					Console.WriteLine("The index value returned is : "+ objString.str.IndexOfAny(c)); 
				else
					Console.WriteLine("The index value returned is : "+ objString.str.LastIndexOfAny(c)); 
				break;
			case 2:
				Console.Write("Enter the string for the character array :");
				strChar=Console.ReadLine();
				c=strChar.ToCharArray();
				Console.Write("Enter the starting Index for search :");
				intStart=int.Parse(Console.ReadLine());		
				if ("first"==strFL)
					Console.WriteLine("The index value returned is : "+ objString.str.IndexOfAny(c,intStart)); 
				else
					Console.WriteLine("The index value returned is : "+ objString.str.LastIndexOfAny(c,intStart)); 
				break;
			case 3:
				Console.Write("Enter the string for the character array :");
				strChar=Console.ReadLine();
				c=strChar.ToCharArray();
				Console.Write("Enter the starting Index for search :");
				intStart=int.Parse(Console.ReadLine());					
				Console.Write("Enter the number of characters to searc :");
				intCount=int.Parse(Console.ReadLine());		
				if ("first"==strFL)
					Console.WriteLine("The index value returned is : "+ objString.str.IndexOfAny(c,intStart,intCount)); 
				else
					Console.WriteLine("The index value returned is : "+ objString.str.LastIndexOfAny(c,intStart,intCount)); 
				break;
			case 4:
				blnStay=false;
				break;
		}
		if (blnStay)
			mtdIndexAnyImpl(strValue,strFL);
	}
	
	private void mtdInsert() {
		Console.WriteLine("String.Insert(int index,string str)  - > this functions returns the original string with \'str\' inserted at \'index\'");
		Console.WriteLine("the original string : " + objString.str);
		Console.Write("Enter the string to be inserted : ");
		string strTmp=Console.ReadLine();
		Console.Write("Enter the position where it has to be inserted :");
		int intTmp=int.Parse(Console.ReadLine());
		objString.str=objString.str.Insert(intTmp,strTmp);
		Console.WriteLine("the modified string : " + objString.str);
	}
	
	private void mtdJoin() {
		string[] s={"welcome","to","the","world","of","c#"};
		Console.WriteLine("1.String.Join(string str,string[] strarr)   - >  this functions joins the string arrays using \'str\'");
		Console.WriteLine("2.String.Join(string str,string[] strarr,int i,int j)   - >  this functions joins the string arrays using \'str\' starting from the \'i\' th array element and \'j\' number of elements after it. ");
		Console.Write("Enter your choice :");
		string strChoice=Console.ReadLine();
		if ("1"==strChoice) {
			Console.WriteLine("The string array is :str[0]=\'welcome\',str[1]=\'to\',str[2]=\'the\',str[3]=\'world\',str[4]=\'of\',str[5]=\'c#\'");
			Console.Write("Enter the string with which to join : ");
			string strTmp=Console.ReadLine();
			Console.WriteLine("The joint string is : " + String.Join(strTmp,s));
		}
		else {
			Console.WriteLine("The string array is :str[0]=\'welcome\',str[1]=\'to\',str[2]=\'the\',str[3]=\'world\',str[4]=\'of\',str[5]=\'c#\'");
			Console.Write("Enter the string with which to join : ");
			string strTmp=Console.ReadLine();
			Console.Write("Enter the starting index of the array : ");
			int intStart=int.Parse(Console.ReadLine());
			Console.Write("Enter the number of elements to join :" );
			int intCount=int.Parse(Console.ReadLine());
			Console.WriteLine("The joint string is : " + String.Join(strTmp,s,intStart,intCount));
			
		}
	}
	
	private void mtdLastIndex() {
		Console.WriteLine("String.LastIndexOf()  - > this returns the index of the last occurence of a charcter or string in the given string.");
		Console.WriteLine("The search of the string stops when the required value is founds or proceedes until the beginning of the string has been reached");
		Console.WriteLine("It returns the index if the value is found or \'-1\' if not found.");
		mtdIndexImpl("LastIndex","last");
	
	}
	
	private void mtdLastIndexAny() {
		Console.WriteLine("String.LastIndexOfAny()  - > this returns the index of the last occurence of any charcter of the character array in the given string.");
		Console.WriteLine("The search of the string stops when the required value is founds or proceedes until the beginning of the string has been reached");
		Console.WriteLine("It returns the index if the value is found or \'-1\' if not found.");
		mtdIndexAnyImpl("LastIndex","last");	
	}
	
	private void mtdLength() {
		Console.WriteLine("String.Length  - > this property returns the length of the string.");
		Console.WriteLine("The length of \'"+objString.str+"\' is : "+objString.str.Length);
	}
	
	private void mtdPadLeft() {
		mtdPad("Left");
	}
	
	private void mtdPad(String strVal) {
		Console.WriteLine("String.Pad"+strVal+"()  - > this method pads spaces or some other character to the "+strVal+" of the string");
		Console.WriteLine("String.Pad"+strVal+"(int i)  -> fills spaces to the "+strVal+" of the string, \'i\' specifies the length of the string along with spaces");
		Console.WriteLine("String.Pad"+strVal+"(int i,char c)  -> fills the character \'c\' to the "+strVal+" of the string, \'i\' specifies the length of the string along with spaces");
		Console.WriteLine("The original string :"+objString.str );
		Console.Write("Enter the length of the desired string : ");
		int intStart=int.Parse(Console.ReadLine());
		Console.Write("Enter the Character to be padded(enter nothing for spaces) :");
		string strTmp=Console.ReadLine();
		if(!strTmp.Equals("")) {
			char c=(strTmp.ToCharArray())[0];
			if ("Left"==strVal)
				Console.WriteLine("The padded string : " + objString.str.PadLeft(intStart,c));
			else
				Console.WriteLine("The padded string : " + objString.str.PadRight(intStart,c));
		}
		else
			if ("Left"==strVal)			
				Console.WriteLine("The padded string : " + objString.str.PadLeft(intStart));	
			else	
				Console.WriteLine("The padded string : " + objString.str.PadRight(intStart));				
	}
	
	private void mtdPadRight() {
		mtdPad("Right");
	}
	
	private void mtdRemove() {
		Console.WriteLine("String.Remove(int i,int j)  - > removes a part of the string.\'i\' represents the start position and \'j\' represents the length of string to be removed.");
		Console.WriteLine("The original string : "+objString.str);
		Console.Write("Enter the starting position : ");
		int intStart=int.Parse(Console.ReadLine());
		Console.Write("Enter the length of string to be removed :");
		int intLength=int.Parse(Console.ReadLine());
		Console.WriteLine("The string after removal :"+objString.str.Remove(intStart,intLength));
	}
	
	private void mtdReplace() {
		Console.WriteLine("String.Replace()   - >  replaces a character with another character or a string with another string throughout the given string");
		Console.WriteLine("1. String.Replace(char cOld,char cNew)  -> replaces all occurances \'cOld\' with \'cNew\'");
		Console.WriteLine("2. String.Replace(string sOld,strin sNew)  -> replaces all occurances of \'sOld\' with \'sNew\'");
		Console.Write("Enter your choice :");
		int intChoice=int.Parse(Console.ReadLine());
		Console.WriteLine("The original string is :"+objString.str);
		if (1==intChoice) {
			Console.Write("Enter the character to be replaced :");
			char cold=(Console.ReadLine().ToCharArray())[0];
			Console.Write("Enter the new character :");
			char cnew=(Console.ReadLine().ToCharArray())[0];
			Console.WriteLine("The string after replacing : "+objString.str.Replace(cold,cnew));
		}
		else {
			Console.Write("Enter the string to be replaced :");
			string sold=Console.ReadLine();
			Console.Write("Enter the new string :");
			string snew=Console.ReadLine();
			Console.WriteLine("The string after replacing : "+objString.str.Replace(sold,snew));
		
		}
	}
	
	private void mtdSplit() {
		Console.WriteLine("This will be done later.");
	}
	
	private void mtdStartsWith() {
		Console.WriteLine("String.StartsWith(string str)  - > returns a boolean value indicating whether the string starts with \'str\'");
		Console.WriteLine("The original string : "+ objString.str);
		Console.Write("Enter the string to search for :");
		string strTmp=Console.ReadLine();
		if (objString.str.StartsWith(strTmp))
			Console.WriteLine("The string \'"+objString.str+"\' starts with \'"+strTmp+"\'.");
		else
			Console.WriteLine("The string \'"+objString.str+"\' does not starts with \'"+strTmp+"\'.");
	}
	
	private void mtdSubStr() {
		Console.WriteLine("String.Substring()  - > retrieves a part of the string from the original string");
		Console.WriteLine("1. String.Substring(int i)  -> retrieves the string starting from \'i\'(zero based)");
		Console.WriteLine("2. String.Substring(int i,int j)  -> retrieves the string starting from \'i\' and having a length \'j\'.");
		Console.Write("Enter your choice :");
		int intChoice=int.Parse(Console.ReadLine());
		int intStart,intLength;
		Console.WriteLine("The original string :"+objString.str);
		if (1==intChoice) {
			Console.Write("Enter the position from where the substring should start :");
			intStart=int.Parse(Console.ReadLine());
			Console.WriteLine("The retrieved substring is :"+objString.str.Substring(intStart));
		}
		else {
			Console.Write("Enter the position from where the substring should start :");
			intStart=int.Parse(Console.ReadLine());
			Console.Write("Enter the length of the substring:");
			intLength=int.Parse(Console.ReadLine());
			Console.WriteLine("The retrieved substring is :"+objString.str.Substring(intStart,intLength));
		}
	}
	
	private void mtdLower() {
		Console.WriteLine("String.ToLower()  - >  returns the string with all its characters in lower case");
		Console.WriteLine("The original string : " + objString.str);
		Console.WriteLine("The string in lower case : " +objString.str.ToLower());
	}
	
	private void mtdUpper() {
		Console.WriteLine("String.ToUpper()  - >  returns the string with all its characters in upper case");
		Console.WriteLine("The original string : " + objString.str);
		Console.WriteLine("The string in upper case : " +objString.str.ToUpper());	
	}
	
	private void mtdTrim() {
		Console.WriteLine("String.Trim()   - > removes white space characters from the begininning and end of the string and also specified characters.");
		Console.WriteLine("1. String.Trim() -> removes white space characters from beginning and end of the string.");
		Console.WriteLine("2. String.Trim(char[] c)  -> removes all occurances of set of characters in the array from the beginning and end of string.");
		Console.Write("Enter your choice :");
		int intChoice=int.Parse(Console.ReadLine());
		Console.WriteLine("The original string : " +objString.str);
		if (1==intChoice) {
			Console.WriteLine("The trimmed string is : "+objString.str.Trim());
		}
		else {
			Console.Write("Enter the character array : ");
			char[] c=Console.ReadLine().ToCharArray();
			Console.WriteLine("The string after removing characters from the array : " + objString.str.Trim(c));
		}
	}
	
	private void mtdTrimEnd() {
		Console.WriteLine("String.TrimEnd(char[] c)  - >  removes all occurances of the set of characters in the array from the end of the string.");
		Console.WriteLine("The original string is : " + objString.str);
		Console.Write("Enter the character array : ");
		char[] c=Console.ReadLine().ToCharArray();
		Console.WriteLine("The modified string is : "+objString.str.TrimEnd(c));
	}
	
	private void mtdTrimStart() {
		Console.WriteLine("String.TrimStart(char[] c)  - >  removes all occurances of the set of characters in the array from the start of the string.");
		Console.WriteLine("The original string is : " + objString.str);
		Console.Write("Enter the character array : ");
		char[] c=Console.ReadLine().ToCharArray();
		Console.WriteLine("The modified string is : "+objString.str.TrimStart(c));		
	}
}