题目：有五个学生，每个学生有3门课的成绩，从键盘输入以上数据（包括学生号，姓名，三门课成绩），计算出平均成绩，况原有的数据和计算出的平均分数存放在磁盘文件 stud 中。-Title: five students, each student a 3-course results, the above data entered the keyboard (including student number, name, three-course results), calculate the av

Using the concepts of classes and structures calculates mathematical equations and make comparisons between fraction based numbers in the form of a/b. Takes up to 4 fractions and does mathematical calculations.