How to check if the given string is palindrome?

Palindrome

Algorithm:

Approach1 : Start comparing characters from start and end of the string and continue until len(string)/2 .
Approach2: Start from front and back and compare the characters if not equal exit and return false else return true

Java Code:

public boolean isPalindrom(String str)

{

int length = str.length();

for(int i=0; i< length/2 ;i++)

{

if(str.charAt(i) != str.charAt(length - 1 - i))

{

System.out.println(str + " is not a palindrom." );

return false;

}

}

System.out.println(str + " is a palindrom." );

return true;

}

Example:

isPalindrom("abqba") ==> true

isPalindrom("abba") ==> true

isPalindrom("abstba")  ==> false

isPalindrom("absa")  ==> false

Ruby Code:

def palindrom(str)

  start = 0

  last = str.size - 1

  array_str = str.chars

  is_palindrom = true

  while (start < last)

    if array_str[start] != array_str[last]

      is_palindrom = false

      break

    end

    start+=1

    last-=1

  end

  is_palindrom

end

p palindrom("radar")

p palindrom("r")

p palindrom("123456")

p palindrom("rr")

p palindrom("radbar")

p palindrom("1radar1")