Python: Closest Palindrome number of a given integer

Python Basic - 1: Exercise-139 with Solution

Write a Python program to find the closest palindrome number to a given integer. If there are two palindrome numbers in absolute distance return the smaller number.

Sample Solution-1:

Python Code:

def test(n):
    x = n
    y = n
    while True:
        if str(x) == str(x)[::-1]:
            return x
        x -=  1
        if str(y) == str(y)[::-1]:
            return y
        y += 1
    return int(bin(n)[::-1][:-2], 2)

n = 120;
print("Original number: ", n);
print("Closest Palindrome number of the said number: ",test(n));
n = 321;
print("Original number: ", n);
print("Closest Palindrome number of the said number: ",test(n));
n = 43;
print("Original number: ", n);
print("Closest Palindrome number of the said number: ",test(n));
n = 1234;
print("Original number: ", n);
print("Closest Palindrome number of the said number: ",test(n));

Sample Output:

Original number:  120
Closest Palindrome number of the said number:  121
Original number:  321
Closest Palindrome number of the said number:  323
Original number:  43
Closest Palindrome number of the said number:  44
Original number:  1234
Closest Palindrome number of the said number:  1221

Flowchart:

Sample Solution-2:

Python Code:

def test(n):
     result = 0
     while n:
          if str(n-result)==str(n-result)[::-1]:
              return n-result
          elif str(n+result)==str(n+result)[::-1]:
              return n+result
          result+=1

n = 120;
print("Original number: ", n);
print("Closest Palindrome number of the said number: ",test(n));
n = 321;
print("Original number: ", n);
print("Closest Palindrome number of the said number: ",test(n));
n = 43;
print("Original number: ", n);
print("Closest Palindrome number of the said number: ",test(n));
n = 1234;
print("Original number: ", n);
print("Closest Palindrome number of the said number: ",test(n));

Sample Output:

Original number:  120
Closest Palindrome number of the said number:  121
Original number:  321
Closest Palindrome number of the said number:  323
Original number:  43
Closest Palindrome number of the said number:  44
Original number:  1234
Closest Palindrome number of the said number:  1221

Flowchart:

Python Code Editor:

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