2017-2018-2 20172315 "Java Programming" course pair programming Exercises _ arithmetic

Pair of people

• Hu Zhihui: infix suffix and calculation of suffix expression
• Peng Lin: Fractional-related procedures and solving small problems

• Ludasui: Topic generation and Compilation of driver classes

  Demand analysis

Goal

1. Automatic generation of topics

可独立使用（能实现自己编写测试类单独生成题目的功能）可生成不同等级题目，类似于：1级题目：2 + 5 =；10 - 5 =之类的两个数，一个运算符的题目

2. Problem calculation (question)

可独立使用实现中缀表达式转为后缀表达式并计算判断用户答题正误，并输出正确结果

3. Support True Score

可独立使用实现分数算式的计算

3. Problem-solving (expansion of demand, plus sub-items)

可独立使用实现对自动生成表达式的去重:如下若生成：2 + 5 =；5 + 2 =为同一题目

Analysis

• Need to design an empty stack, rely on the stack for infix suffix and suffix calculation
• A class is required to generate the topic, and the class should have the method of grading the topic.
• Fractional correlation method is needed to realize the calculation of fractions

• A driver class is required to implement all of the above functions

  Further expansion
• For the score has not been fully realized, next week to make up

• For the problem of the weight has not been achieved, next week to fill

  Design ideas
• First compile a stringtoarithmetic class, realize infix suffix and calculate it
• Then create the fractional class to achieve the fractional calculation
• Create a problem generation class, randomly generated topics

• Finally, the main class is created, which realizes the user's reply and the function of judging right and wrong.

  Difficulties encountered and solutions
• With regard to the problem of de-weight, the implementation of this function has been studied for a long time and has not come up with an exact method. However, I believe this problem will be solved next week.

• There are some minor problems in judging the correct rate of the problem.
  
  After discussion within the group, a solution was drawn, such as
  

Uml

Psp

PSP2.1	Personal software Process Stages	Estimated time-consuming (minutes)	actual time elapsed (minutes)
Planning	Plan	55	75
Estimate	Estimate how long this task will take	3	5
Development	Development	2400	3000
Analysis	Demand analysis (including learning new technologies)	300	360
Coding Standard	Code specification (to develop appropriate specifications for current development)	30	15
Design UML	Design Project UML class diagram	60	120
Coding	Specific code	2000	2400
Code Review	Code review	30	40
Test	Test (self-test, modify code, commit changes)	240	300
Size Measurement	Calculation effort (actual time)	5	5
Postmortem & Process Improvement Plan	Summarize afterwards and propose process improvement plan	30	60
	Total	5153	6380

2017-2018-2 20172315 "Java Programming" course pair programming Exercises _ arithmetic