# How would you reverse a string recursively?

## How would you reverse a string recursively?

Explanation: Recursive function (reverse) takes string pointer (str) as input and calls itself with next location to passed pointer (str+1). Recursion continues this way, when pointer reaches ‘\0’, all functions accumulated in stack print char at passed location (str) and return one by one.

## How do you reverse a string in Python recursively?

Python Program to Reverse a String Using Recursion

1. Take a string from the user.
2. Pass the string as an argument to a recursive function to reverse the string.
3. In the function, put the base condition that if the length of the string is equal to 0, the string is returned.

## How do you reverse a string without recursion?

1. User must enter a string. 2. By giving the increment value as -1, string slicing is used to reverse the list….The program takes a string and reverses the string without using recursion.

1. Take a string from the user.
2. Use string slicing to reverse the string.
3. Print the reversed string.
4. Exit.

## Is reverse recursive function?

Then, the reverse() function is called which is a recursive function. Inside this function, we store the size of the input string in the numOfChars variable.

## How can I reverse a string without TEMP variable?

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 do you reverse a string in a for loop?

Reverse The String Using FOR Loop in C

1. //Reverse the String using FOR Loop.
2. #include
3. #include <string.h>
4. int main(void)
5. {char *str=”ForgetCode”;
6. printf(“Reverse the String:”);
7. for(int i=(strlen(str)-1);i>=0;i–)
8. { printf(“%c”,str[i]);

## How do you reverse print 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 you reverse a string in Java without a loop?

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(System.in);
8. System.out.print(“Enter a string : “);

## Why is there no reverse method in string?

String is immutable, meaning it can’t be changed. When you reverse a String, what’s happening is that each letter is switched on it’s own. and you end up with 4 new String objects on the heap.

## Can we convert StringBuffer to string?

The toString() method of StringBuffer class can be used to convert StringBuffer content to a String. This method returns a String object that represents the contents of StringBuffer. As you can observe that the string object represents the same sequence that we had in StringBuffer.

## Which is better string or StringBuilder?

Objects of String are immutable, and objects of StringBuffer and StringBuilder are mutable. StringBuffer and StringBuilder are similar, but StringBuilder is faster and preferred over StringBuffer for the single-threaded program. If thread safety is needed, then StringBuffer is used.

## What is difference between StringBuffer and StringBuilder in Java?

Java provides three classes to represent a sequence of characters: String, StringBuffer, and StringBuilder….Difference between StringBuffer and StringBuilder.

No. StringBuffer StringBuilder
2) StringBuffer is less efficient than StringBuilder. StringBuilder is more efficient than StringBuffer.

## Does StringBuilder override toString?

Else it’s not a true override, and it shouldn’t even compile since the method signature is the same as Object’s toString() but with a different return type. Instead, sure use a StringBuilder internally within the method body, but return the StringBuilder’s toString() .

## What would happen if you will not override the toString method?

So, whenever you use or print a reference variable of type in which toString() method is not overrided, you will get an output like above. You will not get what the object actually has in it. There will be no information about state or properties of an object.

## How do I override Hashcode?

Overriding hashCode method in Java

1. Take a prime hash e.g. 5, 7, 17 or 31 (prime number as hash, results in distinct hashcode for distinct object)
2. Take another prime as multiplier different than hash is good.
3. Compute hashcode for each member and add them into final hash.
4. Return hash.

## Can we override toString method in Java?

We can override toString() method in our class to print proper output. For example, in the following code toString() is overridden to print “Real + i Imag” form. In general, it is a good idea to override toString() as we get get proper output when an object is used in print() or println().

## How do I override toString method?

To override the ToString method in your class or struct:

1. Declare a ToString method with the following modifiers and return type: C# Copy.
2. Implement the method so that it returns a string. The following example returns the name of the class in addition to the data specific to a particular instance of the class.

## Does toString need override?

The toString() method returns the string representation of the object. If you print any object, java compiler internally invokes the toString() method on the object. So overriding the toString() method, returns the desired output, it can be the state of an object etc.

## What is main ()? Can we write a program without main ()?

We can write c program without using main() function. To do so, we need to use #define preprocessor directive. The C preprocessor is a micro processor that is used by compiler to transform your code before compilation. It is called micro preprocessor because it allows us to add macros.

## Can we execute a program without main () in C?

So actually C program can never run without a main() . We are just disguising the main() with the preprocessor, but actually there exists a hidden main function in the program.

## Can we execute a program without main () method in C++?

No you cannot unless you are writing a program in a freestanding environment (embedded environment OS kernel etc.) where the starting point need not be main() . As per the C++ standard main() is the starting point of any program in a hosted environment .

# How would you reverse a string recursively?

## How would you reverse a string recursively?

Explanation: Recursive function (reverse) takes string pointer (str) as input and calls itself with next location to passed pointer (str+1). Recursion continues this way when the pointer reaches ‘\0’, all functions accumulated in stack print char at passed location (str) and return one by one.

## Which is best suitable for reversing a string?

Explanation: Stack is the most appropriate data structure for reversing a word because stack follows LIFO principle. Operations required for reversing a word or a string using stack are push() and pop(). Explanation: Push operation inserts a character into the stack and pop operation pops the top of the stack.

## How do you reverse a recursive string in C++?

1. #include #include
2. using namespace std;
3. // Recursive function to reverse a given string. // Note string is passed as a reference parameter.
4. void reverse(string &str, int l, int h) {
5. if (l < h) {
6. swap(str[l], str[h]); reverse(str, l + 1, h – 1);
7. } }
8. int main()

## What is the time complexity of the reverse the string?

3 Answers. You cannot reverse a string in O(1) time, however, you can do so with O(1) space complexity. Most likely it was reverse it in one-liner , as it’s not even clear what an “operation” is really is.

## How do I reverse a string without using stack?

Without Using Stack

1. Initialize a string of length n.
2. Traverse the string till half of it’s the length and swap the character at the current index with character at length – current index – 1 position.
3. Print the string.

## What is the time complexity of reverse function in C++?

reverse() is a predefined function in header file algorithm. It is defined as a template in the above mentioned header file. It reverses the order of the elements in the range [first, last) of any container. The time complexity is O(n).

## How do I reverse a string using stacks?

Stack – Reverse a String using Stack

1. String to Char[].
2. Create a Stack.
3. Push all characters, one by one.
4. Then Pop all characters, one by one and put into the char[].
5. Finally, convert to the String.

## How to reverse a string with a recursive function?

your reverse body will not work at all. The idea to reverse is as follows: If the string len is 1, return it. Otherwise, Remove the first character. Recursively reverse the remaining string. Add the first character above to the reversed string. Return the new string. If you return string, the shortest version you can get will be this:

## Is there a recursive way to reverse a linked list?

We have discussed an iterative and two recursive approaches in previous post on reverse a linked list. In this approach of reversing a linked list by passing a single pointer what we are trying to do is that we are making the previous node of the current node as his next node to reverse the linked list.

## Is there a way to reverse a string?

On top of that, the logic in string_reverse () is a long way from doing anything approaching reversing a string. your reverse body will not work at all. The idea to reverse is as follows: If the string len is 1, return it. Otherwise, Remove the first character. Recursively reverse the remaining string.

## How to return a pointer to a previous node in a linked list?

We return the pointer of next node to his previous (current) node and then make the previous node as the next node of returned node and then returning the current node. We first traverse till the last node and making the last node as the head node of reversed linked list and then applying the above procedure in the recursive manner.

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