Program to check a number is palindrome or not without help of a string in Python

Suppose we have a non-negative integer called num, we have to check whether it is a palindrome or not. We have to solve it without using strings

So, if the input is like num = 25352, then the output will be True

To solve this, we will follow these steps −

• a := 0

• c := num

• while num > 0, do

  • r := num mod 10

  • num := floor of num / 10

  • a :=(10 * a) + r

• if a is same as c, then

  • return True

• otherwise return False

Example

Let us see the following implementation to get better understanding

def solve(num):
   a = 0
   c = num
   while num > 0:
      r = num % 10
      num = num // 10
      a = (10 * a) + r
   if a == c:
      return True
   else:
      return False

num = 25352
print(solve(num))

Input

25352

Output

True

Arnab Chakraborty

Updated on: 12-Oct-2021

6K+ Views

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