创建生成100个互不相等的随机三位整数，并将它们存入一个数据文件mydt.dat中。从数据文件中读取所有数据，将这些数据按第二位构成数字的升序排列，如果第二位构成数字相等，则按第三位构成数字的降序排列，将排序结果输出到：一个数据文件mysd.dat文件和一个文本文件mysd.txt文件中。(Creates 100 randomly generated three bit integers that are not equal to each other and stores them in a data file called mydt.dat. Read all of the data from the data file, these data will be constituted by second digits in ascending order, if the second pose is equal to the number, according to the third constitution arrangement number descending, will sort the output to a data file mysd.dat file and a text file in the mysd.txt file.)