输入学生各门成绩，能够计算学分，优秀率，优良率。-Enter the doors of student performance, to calculate the credit, excellent rates, good rates.

利用VC环境下的mfc框架编写的GPA计算器，可以提供多种计算方法。-VC environment mfc framework prepared by the GPA calculator can provide a variety of calculation methods.