回文是指数字或文本正向和逆向读时都一样的文本。例如，下列五位整数都是回文： 12321、55555、45554和11611。写出判断一个五位num为回文的表达式-Palindrome refers to the forward and reverse reading of the numbers or text are the same text. For example, the following five integers are palindromes: 12321,55555,45554 and 11611. Write expressions of judgment of a five-num is a palindrome