student

代码说明：

  有一学生成绩管理数据库如下表，要求建立一SAS数据集score，并输出显示 创建一个新的数据集class，新增平均成绩aver变量和等级考评grade变量，grade的值是根据aver值的大小给出A、B、C、D四个等级，并显示新数据集class(A student achievement management database as the table, called for the establishment of a SAS data set score, and output display create a new data set class, add an average score aver evaluation variables and grade level variables, grade values are based on the size of a aver value the A, B, C, D four grades, and displays the new data set of class)

文件列表：

实验一
......\1.1.sas,367,2010-03-10
......\1.2.sas,732,2010-03-10
......\1.3.sas,1201,2010-03-11
......\1.lst,12263,2010-03-10
......\2.lst,52867,2010-03-10
......\实验一
......\......\chap1.ppt,1521152,2010-03-10
......\......\example1_10.sas,850,2010-03-11
......\......\example1_2.sas,703,1998-07-24
......\......\example1_3.sas,2614,1998-07-28
......\......\example1_4.sas,735,1998-07-24
......\......\example1_8.sas,1201,2010-03-11
......\......\example_data.sas,427,2010-03-10
......\......\exersice1_1.txt,243,2004-05-09
......\......\exersice1_7.txt,744,2004-07-26
......\......\实验一.doc,33792,2010-03-10