参考号：EM13826

Write the code

作业1 ：（面向对象的设计）

Write a program that allows an instructor to keep a grade book. Each students has scores for exams, homework assignments, and quizzes. Grading scales convert the total scores in each category into letter grades (e.g., 100-94 = A, 93-91 = A-,90-88 =B+, etc.) To determine the final grade, the category grades are converted to numeric values (A = 4.0, A- =,3.7, B+=3.3, etc.). Those scores are weighted according to a set of weights (e.g., exams 40%, homework 35%, quizzes 25%), and the resulting numeric value is again converted into a letter grade. Design a user interface that firms up the requirements, use CRC cards to discover classes and methods, provide class diagrams, and implement your program.

作业2 :(统一建模语言）

航空公司座位。设计和实施一个在飞机上分配座位的程序。假设飞机在头等舱中有20个席位（每个座位为5行，被过道隔开）和经济舱的180个席位（每个30行，每排30行，由过道隔开）。您的程序应采用三个命令：添加乘客，表演座位和退出。当添加乘客时，要求班级（第一或经济），一起旅行的乘客人数（一流的1或2；经济中的1至3个）和座位偏好（一流的过道或窗户：过道：过道，中心或经济窗口）。然后尝试找到比赛并分配座位。如果不存在匹配，请打印一条消息。