Reverse String Wordwise

Question: 

Reverse the given string word wise. That is, the last word in given string should come at 1st place, last second word at 2nd place and so on. Individual words should remain as it is.

Input format :

String in a single line

Output format :

Word wise reversed string in a single line

Constraints :

0 <= |S| <= 10^7
where |S| represents the length of string, S.

Sample Input 1:

Welcome to Coding Ninjas

Sample Output 1:

Ninjas Coding to Welcome

Ans: package learningJava;

import java.util.*;

/**

* This program demonstrates a function to reverse words in a given string.

* It takes a string as input and reverses the order of words in the string.

*/

public class regPract {

/**

* Reverses the order of words in a given string.

*

* @param end The ending index of the input string.

* @param start The starting index for extracting a word.

* @param j An index variable used in loops.

* @param input The input string to reverse.

* @return The reversed string.

*/

public static String reverseString(int end, int start, int j, String input) {

String result = "";

String word = "";

// Traverse the input string from right to left.

for (int i = input.length() - 1; i >= 0; i--) {

if (input.charAt(i) == ' ') {

// When a space is encountered, extract and reverse a word.

start = i + 1;

word = "";

for (j = start; j <= end; j++) {

word += input.charAt(j);

}

end = i - 1;

result = result + word + " ";

}

}

// Extract and reverse the last word in the string.

word = "";

for (j = 0; j <= end; j++) {

word = word + input.charAt(j);

}

result += word;

return result;

}

public static void main(String[] args) {

String input = "Helo I am Aadil";

int end = input.length() - 1;

int start = 0;

int j = 0;

// Call the reverseString function to reverse the input string.

String reversed = reverseString(end, start, j, input);

// Print the reversed string.

System.out.println("Reversed String: " + reversed);

}

}