Python 程序如何检查二进制表示是不是回文？

这里，我们用不同的 Python 内置函数。首先，我们使用 bin() 将数字转换为其二进制形式，然后反转字符串的二进制形式并比较与原先的情形，如果匹配，则为回文，否则不是回文。

示例

Input: 5
Output: palindrome

解释

5 的二进制表示是 101

反转它，结果为 101，然后比较，发现与原先的情形匹配。

因此它是一个回文。

算法

Palindromenumber(n)
/* n is the number */
Step 1: input n
Step 2: convert n into binary form.
Step 3: skip the first two characters of a string.
Step 4: them reverse the binary string and compare with originals.
Step 5: if its match with originals then print Palindrome, otherwise not a palindrome.

示例代码

# To check if binary representation of a number is pallindrome or not
defpalindromenumber(n): 
   # convert number into binary bn_number = bin(n)      
   # skip first two characters of string
   # Because bin function appends '0b' as 
   # prefix in binary 
   #representation of a number bn_number = bn_number[2:]
   # now reverse binary string and compare it with original
   if(bn_number == bn_number[-1::-1]):
      print(n," IS A PALINDROME NUMBER")
   else:
      print(n, "IS NOT A PALINDROME NUMBER")
# Driver program
if __name__ == "__main__":
   n=int(input("Enter Number ::>"))
   palindromenumber(n)

输出

Enter Number ::>10
10 IS NOT A PALINDROME NUMBER
Enter Number ::>9
9 IS A PALINDROME NUMBER

更新于： 2019-07-30

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