הפוך מקוון מחרוזת

Here is some Java code to reverse a string recursively.

Could someone provide an explanation of how it works?

public static String reverse(String str) {    if ((null == str) || (str.length() <= 1)) {        return str;    }    return reverse(str.substring(1)) + str.charAt(0);}

I'm not understanding how this can possibly work.

What is the best way to loop over a python string backwards?

The following seems a little awkward for all the need of -1 offset:

string = "trick or treat"for i in range(len(string)-1, 0-1, -1):    print string[i]

The following seems more succinct, but is it actually generate a reversed string so that there is a minor performance penalty?

string = "trick or treat"for c in string[::-1]:    print c

I have created a code reverse a string but for some reason it is not working. But I think my logic is right. Then why is it not working??

#include <stdio.h>#include <stdlib.h>int main() {    char words[100];    int i=0;    printf("Enter a word/sentence: ");    scanf("%s", words);    while (words[i]!='\0') {           ++i;    }    printf("\nThe Reverse is: ");    while (i<=0) {         printf("%s",words[i]);         i--;     }     return 0;}

This is my demo.jsp code ,here i'm writing code as follow,result showing as No line found exception where as i executed the code in java class working fine.How can i execute the revers e of string in jsp page?

Scanner sc = new Scanner(System.in);        System.out.println("Enter String :");        String n = sc.nextLine();        String rev = "";        int len = n.length();        for (int i = len - 1; i >= 0; i--) {            rev = rev + n.charAt(i);        }        out.println("Reverse of Given String is :");        out.println("" + rev);

Can anyone tell me how to write a Java program to reverse a given sentence?

For example, if the input is:

"This is an interview question"

The output must be:

"question interview an is this"