Introduction - If you have any usage issues, please Google them yourself
Reading from the keyboard into a class of students (number < = 15) of the examination results, all separated by commas or spaces student achievement, and then the results for the class descending order, requirement that sort the results, and the results were statistically class given less than 60 minutes, 60 segments, 70 segments, 80 segments and 90 sub-class of each section, and the average number of points.