C# Program to Reverse a String

 C# Program to Reverse a String

Most of the IT companies check the coding skills and problem-solving skills as well along with the theoretical interview questions. Sometimes you are free to write the pseudo code and sometimes you are asked to write the complete program either on any paper or any editor. 

This question is asked in the coding interview to write the program. Here you can find the program as well as a live running program so that you can test the program immediately.

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Question: 

How can you reverse a given string without using any library function? Write a program to reverse a given string.

C# Program To Reverse a String

       
 

// Author 	: Tech Point Fundamentals
// Website 	: www.techpointfunda.com
// Channel	: https://www.youtube.com/c/TechPointFundamentals
// Demo		: Reverse a string without using any function

using System;
					
public class Program
{

public static void Main()
{
	string inputString = "TechPointFundamentals";
	string reversedString = ReverseString(inputString);

	Console.WriteLine("Input String : " + inputString);
	Console.WriteLine("Reversed String With CharArray Logic: " + reversedString);
	Console.WriteLine("Reversed String With CharArray Logic and Temp Variable: " +  ReverseString2(inputString));
	Console.WriteLine("Reversed String Without CharArray Logic: " +  ReverseString3(inputString));	

}
    

static string ReverseString(string inputString)  
{        
	char[] charArray = inputString.ToCharArray();  
	for (int i = 0, j = inputString.Length - 1; i < j; i++, j--)  
	{  
		charArray[i] = inputString[j];  
		charArray[j] = inputString[i];  
	}  
	string reversedString = new string(charArray);
	return reversedString;		
}

public static string ReverseString2(string inputString)
{			
 char[] charArray = inputString.ToCharArray();
 char temp;
 for (int j = 0; j < inputString.Length / 2; j++)
 {          
	temp = charArray[j];
	charArray[j] = charArray[charArray.Length - j - 1];
	charArray[charArray.Length - j - 1] = temp;
 }   
 
 return  new string(charArray);
}

public static string ReverseString3(string inputString)
{
 string result = "";		

 for (int i = inputString.Length - 1; i >= 0; i--)
 {
	 result += inputString[i];
 }
 
 return result;
}	 
}

Output: 

                Input String : TechPointFundamentals

Reversed String With CharArray Logic: slatnemadnuFtnioPhceT

Reversed String With CharArray Logic and Temp Variable: slatnemadnuFtnioPhceT

Reversed String Without CharArray Logic: slatnemadnuFtnioPhceT

Live Demo

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