Question: How To Reverse A String Without String Manipulation Functions?


How do you reverse a string without reverse function?

Example to reverse string in Java by using static method

  1. import java.util.Scanner;
  2. public class ReverseStringExample3.
  3. {
  4. public static void main( String [] arg)
  5. {
  6. ReverseStringExample3 rev=new ReverseStringExample3();
  7. Scanner sc=new Scanner(;
  8. System.out.print(“Enter a string: “);

How would you write a function to reverse a string and can you do that without a temporary string?

Algorithm to Reverse String Without Temporary Variable

  1. Store start index in low and end index in high.
  2. Here, without creating a temp variable to swap characters, we use xor(^).
  3. Traverse the input string “s”.
  4. Swap from first variable to end using xor.
  5. Return the final output string.

How can I reverse a string in C++ without function?

C, C++ Program to Reverse a String without using Strrev Function

  1. Initialize a variable.
  2. Take a input from user.
  3. Count the length of a input string, As we are not using any in-built function.
  4. Swap the position of an element.

How can I reverse a string without using reverse function in C ++?


  1. Calculate the length (Len) of string.
  2. Initialize the indexes of the array. Start = 0, End = Len-1.
  3. In a loop, swap the value of pszData[Start] with pszData[End].
  4. Change the indexes’ of the array as follows. Start = start +1; End = end – 1.
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How do I reverse a string?

By Using StringBuilder StringBuilder or StringBuffer class has an in-build method reverse () to reverse the characters in the string. This method replaces the sequence of the characters in reverse order. The reverse method is the static method that has the logic to reverse a string in Java.

How can you reverse a string?

Method 1: Reverse a string by swapping the characters

  1. Input the string from the user.
  2. Find the length of the string. The actual length of the string is one less than the number of characters in the string.
  3. Repeat the below steps from i = 0 to the entire length of the string.
  4. rev[i] = str[j]
  5. Print the reversed string.

How do I reverse a string pointer?

Reverse a string using pointers

  1. #include <stdio.h>
  2. #include <conio.h>
  3. void main()
  4. char *s;
  5. int len,i;
  6. printf(“nENTER A STRING: “);
  7. gets(s);
  8. len=strlen(s);

How do you reverse a string in a for loop?

Reverse a String Using for Loop

  1. static void Main( string [] args)
  2. {
  3. string _Inputstr = string.Empty, _Reversestr = string.Empty;
  4. Console.Write(“Enter the string: “);
  5. _Inputstr = Console.ReadLine();
  6. for (inti = _Inputstr.Length – 1; i >= 0; i–)
  7. {
  8. _Reversestr += _Inputstr[i];

How do you reverse a string in a while loop?

Using while loop

  1. # Reverse string.
  2. # Using a while loop.
  3. str = “JavaTpoint” # string variable.
  4. print (“The original string is: “,str)
  5. reverse_String = “” # Empty String.
  6. count = len(str) # Find length of a string and save in count variable.
  7. while count > 0:

How do I reverse a string in STL?

How do you reverse a string?

  1. Using the built-in reverse function. C++ has an in-built reverse function, that can be called to reverse a string.
  2. Using a loop. Within the main body of the function, a loop can be written to reverse a string.
  3. Using a function.
  4. Creating a new string.
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How do you reverse a number?

Where reverse is a variable representing the reverse of number.

  1. Step 1 — Isolate the last digit in number. lastDigit = number % 10.
  2. Step 2 — Append lastDigit to reverse. reverse = ( reverse * 10) + lastDigit.
  3. Step 3-Remove last digit from number. number = number / 10.
  4. Iterate this process. while ( number > 0)

How do you reverse a list?

Reversing a list in-place with the list. reverse () method. Using the “ [::-1] ” list slicing trick to create a reversed copy. Creating a reverse iterator with the reversed() built-in function.

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