First, the needs analysis
Four operations need to automatically generate a program questions, ranging from less than 100, whether or not containing the operands is negative, discarding duplicates formula, result.txt file in the external display .
Second, the functional implementation:
·basic skills
(1) automatically generates four arithmetic operation of Equation 2 number less than 10 100 (+ - * /), operation results are required within 100
Number (2) title can be customized.
(3) parameters can be controlled.
Whether to include multiplication and division.
Operand controllable range of values (e.g., operands within 100 or within 1000).
Whether operands containing negative.
Third, the design and implementation:
1. The incoming packet.
import java.io.FileNotFoundException；
import java.io.PrintStream;
import java.util.Scanner;
java.util.Random import;
2. The use of a random number generated random achieve '
= R & lt new new the Random the Random ();
int r.nextInt A = () + 100%. 1; // range generated number is less than 100
int r.nextInt B = () + 100%. 1; // number generation range is less than 100
3. The use of the Java language as well as some of the ways to achieve the basic functions.
Fourth, the test run:
The basic testing function and automatically generates four arithmetic operation of Equation 2 number less than 10 100 (+ - * /), are less than 100 requires the calculation result. Including multiplication and division, the controllable range of values of the operands (e.g., operands within 100 or within 1000), whether the operand also containing a controllable negative.
Five more satisfied snippet:
System.out.print ( "Please enter the number of Title:");
int a Tg of t.nextInt = ();
// number of control subject
System.out.print("请输入操作数的范围（如 100，1000等）:");
int tf = t.nextInt();
//控制题目范围
System.out.println("请选择是否有负数：1:有 0:没有");
int zf = t.nextInt();
//控制正负数
System.out.println("请选择是否包含*或者/：2:否 4:是 ");
int fu = t.nextInt();
//控制符号
System.setOut(ps);
六、总结
觉得自己以前学习的东西都忘了好多，看到题目时的第一个想法就是“我不会”，后来翻看了一下以前的课本，又去网上百度了一下一些方法，实现了一些基本功能，五个基本功能，我只实现了三个，
查重和存储到外部文件并没有实现，以后会继续努力，不断实现。
七、PSP
| PSP2.1 |
任务内容 |
计划共完成需要的时间(min) |
实际完成需要的时间(min) |
| Planning |
计划 |
10 |
15 |
| · Estimate |
· 估计这个任务需要多少时间，并规划大致工作步骤 |
5 |
6 |
| Development |
开发 |
60 |
120 |
| ·· Analysis |
需求分析 (包括学习新技术) |
20 |
50 |
| · Design Spec |
· 生成设计文档 |
10 |
15 |
| · Design Review |
· 设计复审 (和同事审核设计文档) |
5 |
10 |
| · Coding Standard |
代码规范 (为目前的开发制定合适的规范) |
5 |
5 |
| · Design |
具体设计 |
20 |
30 |
| · Coding |
具体编码 |
30 |
50 |
| · Code Review |
· 代码复审 |
5 |
10 |
| · Test |
· 测试（自我测试，修改代码，提交修改） |
9 |
15 |
| Reporting |
报告 |
10 |
20 |
| ·· Test Report |
· 测试报告 |
3 |
3 |
| · Size Measurement |
计算工作量 |
2 |
1 |
| · Postmortem & Process Improvement Plan |
· 事后总结 ,并提出过程改进计划 |
5 |
5 |