查找出两个文件中具有某一相同字段的行，输入：两个文件名

如文件一是有100行的学生学号和姓名，文件二是1000行的学生学号及考试成绩

输出：二个文件

文件一为查找出的100行的学生学号及考试成绩，文件二为未查找出的900行的学生学号及考试成绩



可对原码做相应修改，来得到需要的字段，如把两个文件拼成一个，或只取其中相应字段等-Find out the two files in the same field with a line, enter: First, the two file names as the file has 100 lines of students to learn number and name, the file is 1000 lines of the second number of students study and examination results output: two files documents in the 100 to find out the number line and test scores of students learning, Paper is not to find out the 900 line number and test scores of students learning the original code can be amended accordingly, to get the required fields, such as the two makes up a file, or just take one of the appropriate fields, etc.