On-line Cadeia Reversa

find the number of characters that do not change position after the given word is reversed? (return an integer)

example : adbcbfgthe word after reversing is gfbcbda and b,c,b haven't changed their position, so the answer will be 3(characters have not changed their position). Case sensitive

My string is "csm15+abc-indiaurban@v2". I want only "indiaurban" from my string. what I am doing right now is :

var lastindexofplusminus = input.LastIndexOfAny(new char[]{'+','-'});var lastindexofattherate = input.LastIndexOf('@');string sub = input.Substring(lastindexofplusminus,lastindexofattherate);

but getting error "Index and length must refer to a location within the string."

Thanks in Advance.

How can we reverse a simple string in Go?

Here I want to find all possible palindromes in a string.

palindrome meaning:- a word, phrase, or sequence that reads the same backwards as forwards,

e.g. madam or nun.

So I took a string. Split it into a list. Then took every element in list at a time. Then took combinations of all the elements until last element of list.

a=str(input("enter the string:-"))b=a.split()for i in range(len(b)):    for j in range(i+1,len(b)):        t=b[i:j]        r=t.reverse()        if t == r:            print(t)

I can't get any output even after I wrote the code as logical as I can

For example:-

if a="Rotator"

output:-

tatotato

and many if possible in it.

I can't find where I have gone wrong, or where loophole is.

So I have this function:

function toAlpha($data){    $alphabet =   array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z');    $alpha_flip = array_flip($alphabet);    if($data <= 25){      return $alphabet[$data];    }    elseif($data > 25){      $dividend = ($data + 1);      $alpha = '';      $modulo;      while ($dividend > 0){        $modulo = ($dividend - 1) % 26;        $alpha = $alphabet[$modulo] . $alpha;        $dividend = floor((($dividend - $modulo) / 26));      }       return $alpha;    }}

which given a number converts it into character and it works fine

but then I also want a reverse function of this that given any output of this function, return the exact input that was put in to produce that output and I tried this:

function toNum($data){$alphabet =   array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z');    $alpha_flip = array_flip($alphabet);  if(strlen($data) == 1){          return (isset($alpha_flip[$data]) ? $alpha_flip[$data] : FALSE);        }        else if(strlen($data) > 1){          $num = 1;          for($i = 0; $i < strlen($data); $i++){            if(($i + 1) < strlen($data)){              $num *= (26 * ($alpha_flip[$data[$i]] + 1));            }            else{              $num += ($alpha_flip[$data[$i]] + 1);            }          }          return ($num + 25);        }}

but it's not working properly...toAlpha(728) is producing 'aba' but toNum('aba') is producing 1378 rather than 728...

what did I do wrong? how can I fix the reverse function so that it works properly?

thanks in advance!