five Python programs to check whether a string is a palindrome or not:
### 1. Using Slicing:
```python
# Program 1: Checking if a string is a palindrome using slicing
def is_palindrome(s):
return s == s[::-1]
string = "radar"
print(f"{string} is a palindrome:", is_palindrome(string))
```
### 2. Using Iterative Approach:
```python
# Program 2: Checking if a string is a palindrome using iterative approach
def is_palindrome(s):
length = len(s)
for i in range(length // 2):
if s[i] != s[length - i - 1]:
return False
return True
string = "level"
print(f"{string} is a palindrome:", is_palindrome(string))
```
### 3. Using Recursion:
```python
# Program 3: Checking if a string is a palindrome using recursion
def is_palindrome(s):
if len(s) < 2:
return True
if s[0] != s[-1]:
return False
return is_palindrome(s[1:-1])
string = "noon"
print(f"{string} is a palindrome:", is_palindrome(string))
```
### 4. Using List Reversal:
```python
# Program 4: Checking if a string is a palindrome using list reversal
def is_palindrome(s):
reversed_string = ''.join(reversed(s))
return s == reversed_string
string = "madam"
print(f"{string} is a palindrome:", is_palindrome(string))
```
### 5. Using Deque:
```python
# Program 5: Checking if a string is a palindrome using deque
from collections import deque
def is_palindrome(s):
deque_string = deque(s)
while len(deque_string) > 1:
if deque_string.popleft() != deque_string.pop():
return False
return True
string = "racecar"
print(f"{string} is a palindrome:", is_palindrome(string))
```
Each of these programs checks whether the given string is a palindrome or not using different approaches - slicing, iterative approach, recursion, list reversal, and deque. Feel free to replace the `string` variable with any desired string to check for palindrome.
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