根据学生输入的成绩判断学生的等级！添加了输入控制，当输入不正确时提示出错（例如输入字符，或输入的分数大于100小于0）。-students admitted under the judgment results of grading students! Add the importation of control when the input is not correct mistakes suggested (for example, the importation of character

用对话框的形式完成计算平均成绩的程序,输入各科成绩显示平均成绩-It completed to compute the average by using dialog

对输入的成绩进行显示，并通过姓名可以查找成绩-The results of the input display, and you can find the results by name