数据结构栈和队列的基本操作及其应用。对于一个从键盘输入的字符串，判断其是否为回文。回文即正反序相同。如“abba”是回文，而“abab”不是回文。-Stack and queue data structure of the basic operation and its application. For a string from the keyboard input, determine whether the palindrome. Palindrome sequence that is the same as the pros and cons. Such as