C语言入门练习程序，是一个关于逆向输出字符串的单词的小程序-C language entry to practice program is a word on the reverse of the output string of small programs

计算一串数字的逆序数，即交换多少次可以使数字串有序；-The reverse calculation of the number of string figures, that is, how many times will enable the exchange of digital string and orderly