C++----bool 1.操作子boolalpha通知流将bool值解析为单词（true或false），代码如下：
okay: abc == abcokay: abc >= abcokay: abc <= abcokay: abcd != abcokay: abcd > abcokay: abcd >= abcokay: abcd != abceokay: abcd < abceokay: abcd <= abce
