第一次冲刺：
每个员可以各自完成自己的分配好的模块
罗伟业：加减算术----乘除算式 返回一个完整正确（加减、乘除）的算式<考虑到低年级还没有完全掌握四则混合运算>
康取：四则混合运算算式 返回一个完整正确的混合四种运算的算式 <含分数>
陈键：四则混合+括号混合 返回一个完整正确的混合四种运算的算式 <含分数>
现在也基本达到了目标 .
基本能够达到预想效果< UI - 。-不堪入目 有待提高.>
在完成过程中想到了
----存储 一些默认设置 比如模式和难度的选择等等的数据
-----增加一个对题 错题的 比较.分数显示.
-----设置输入内容只能是数值 。不能是分数，保留三位小数.<规划输入格式>
1 package com.example.testc;
2 import java.math.BigDecimal;
3 import java.util.Random;
4 import android.app.Activity;
5 import android.os.Bundle;
6 import android.view.View;
7 public class MainActivity extends Activity {
8 private Calculator calculator = new Calculator();
9 private Double intemp ;
10 @Override
11 protected void onCreate(Bundle savedInstanceState) {
12 super.onCreate(savedInstanceState);
13 setContentView(R.layout.activity_main);
14 }
15 public void onclick(View v) {
16 switch (v.getId()) {
17 case R.id.createone:
18 String a = createOperation();
19 calculator.setExpression(a);
20 adjustResult( calculator.getResult() ,"1");
21 System.out.println(a + "===" +intemp+ "====" + calculator.getResult());
22 break;
23 }
24 }
25
26 /** 比较答案的对错，精度为0.001 **/
27 public boolean adjustResult(String CorrectResult, String userResult) {
28 BigDecimal correctAnswer = new BigDecimal(CorrectResult);
29 BigDecimal userAnswer = new BigDecimal(userResult);
30 double cAnswer;
31 double uAnswer;
32
33 cAnswer = correctAnswer.doubleValue();
34 uAnswer = userAnswer.doubleValue();
35 int ax = (int) Math.round(cAnswer * 1000) ;
36 cAnswer = ax /1000.0;
37 intemp=cAnswer;
38 if (Math.abs(cAnswer - uAnswer) < 0.001 )
39 return true;
40 return false;
41 }
42
43 public String createOperation() {
44 Random seed = new Random();
45 final String ADD = "+" + "";
46 final String MINUS = "-" + "";
47 final String MULTIPLY = "x" + "";
48 final String DEVIDE = "/" + "";
49
50 // 操作数的个数.而且最多为五个,默认三个操作数
51 int number = 3;
52 String datas[] = new String[5];
53 String op[] = new String[5];
54
55 /** 生成 操作数个数 **/
56 int numberSeeder = seed.nextInt(4) + 1;
57
58 if (numberSeeder == 1)
59 number = 3;
60 else if (numberSeeder == 2 || numberSeeder == 4)
61 number = 4;
62 else if (numberSeeder == 3)
63 number = 5;
64
65 /** 生成 操作数 跟 符号 **/
66 for (int i = 0; i < number; i++) {
67 int jud = seed.nextInt(100);
68 if (jud < 20) {
69 datas[i] = fraction();
70 } else if (jud < 100) {
71 datas[i] = integerCreater();
72 }
73 if (i<number-1) {
74 /** 操作数的个数都是比符号的个数多一个 **/
75 int judp= seed.nextInt(4) + 1;
76 if (judp == 1)
77 op[i] = ADD;
78 else if (judp == 2)
79 op[i] = MINUS;
80 else if (judp == 3)
81 op[i] = MULTIPLY;
82 else if (judp== 4)
83 op[i] = DEVIDE;
84 }
85 }
86 return createBrackets(datas, op, number);
87 }
88 /** create an integer **/
89 public String integerCreater() {
90 Random seed = new Random();
91 String data;
92 data = String.valueOf(seed.nextInt(300) + 1);
93 return data;
94 }
95 /** create a fraction **/
96 public String fraction() {
97 final String DEVIDE = "/" + "";
98 final String leftear = "(" + "";
99 final String rightear = ")" + "";
100 int First = 1, second = 1;
101 Random seeder = new Random();
102 First = seeder.nextInt(20) + 1;// 分子
103 second = seeder.nextInt(20) + 1;// 分母
104 return leftear + First + DEVIDE + second + rightear;
105 }
106
107 /** brackets block 操作数据数组 、 操作符 、 个数 **/
108 public String createBrackets(String datas[], String operator[], int number) {
109 final String leftear = "(" + "";
110 final String rightear = ")" + "";
111 Random seeder = new Random();
112 String bracketOperation = null;
113 switch (number) {
114 case 3:
115 if (seeder.nextInt() / 2 == 0)
116 bracketOperation = leftear + datas[0] + operator[0] + datas[1]
117 + rightear + operator[1] + datas[2];
118 else
119 bracketOperation = datas[0] + operator[0] + leftear + datas[1]
120 + operator[1] + datas[2] + rightear;
121 break;
122 case 4:
123 int temp = seeder.nextInt(21) + 1;
124 temp = temp % 7 + 1;
125 switch (temp) {
126 case 1:// (a+b)x(a+b)
127 bracketOperation = leftear + datas[0] + operator[0] + datas[1]
128 + rightear + operator[1] + leftear + datas[2]
129 + operator[2] + datas[3] + rightear;
130 break;
131 case 2:// ((a+b)+b)+b
132 bracketOperation = leftear + leftear + datas[0] + operator[0]
133 + datas[1] + rightear + operator[1] + datas[2]
134 + rightear + operator[2] + datas[3];
135 break;
136 case 3:// (a+(a+b))+b
137 bracketOperation = leftear + datas[0] + operator[0] + leftear
138 + datas[1] + operator[1] + datas[2] + rightear
139 + rightear + operator[2] + datas[3];
140 break;
141 case 4:// (a+b)+a+b
142 bracketOperation = leftear + datas[0] + operator[0] + datas[1]
143 + rightear + operator[1] + datas[2] + operator[2]
144 + datas[3];
145 break;
146 case 5:// a+b+(a+b)
147 bracketOperation = datas[0] + operator[0] + datas[1]
148 + operator[1] + leftear + datas[2] + operator[2]
149 + datas[3] + rightear;
150 break;
151 case 6:// a+(a+b)+b
152 bracketOperation = datas[0] + operator[0] + leftear + datas[1]
153 + operator[1] + datas[2] + rightear + operator[2]
154 + datas[3];
155 break;
156 case 7:// (a+b+c)+a
157 bracketOperation = leftear + datas[0] + operator[0] + datas[1]
158 + operator[1] + datas[2] + rightear + operator[2]
159 + datas[3];
160 break;
161 }
162 break;
163 case 5:
164 int dicision = seeder.nextInt(33) + 1;
165 dicision = dicision % 9 + 1;
166 switch (dicision) {
167 case 1:// (a+(a+b))+a+b
168 bracketOperation = leftear + datas[0] + operator[0] + leftear
169 + datas[1] + operator[1] + datas[2] + rightear
170 + rightear + operator[2] + datas[3] + operator[3]
171 + datas[4];
172 break;
173 case 2:// ((a+b)+a)+a+a
174 bracketOperation = leftear + leftear + datas[0] + operator[0]
175 + datas[1] + rightear + operator[1] + datas[2]
176 + rightear + operator[2] + datas[3] + operator[3]
177 + datas[4];
178 break;
179 case 3:// (a+b)x(a+b)+a
180 bracketOperation = leftear + datas[0] + operator[0] + datas[1]
181 + rightear + operator[1] + leftear + datas[2]
182 + operator[2] + datas[3] + rightear + operator[3]
183 + datas[4];
184 break;
185 case 4:// (a+b)x(a+b+a)
186 bracketOperation = leftear + datas[0] + operator[0] + datas[1]
187 + rightear + operator[1] + leftear + datas[2]
188 + operator[2] + datas[3] + operator[3] + datas[4]
189 + rightear;
190 break;
191 case 5:// (a+b)x(a+b+c)
192 bracketOperation = leftear + datas[0] + operator[0] + datas[1]
193 + rightear + operator[1] + leftear + datas[2]
194 + operator[2] + datas[3] + operator[3] + datas[4]
195 + rightear;
196 break;
197 case 6:// (a+b)+a+(a+b)
198 bracketOperation = leftear + datas[0] + operator[0] + datas[1]
199 + rightear + operator[1] + datas[2] + operator[2]
200 + leftear + datas[3] + operator[3] + datas[4]
201 + rightear;
202 break;
203 case 7:// ((a+b)+a)X(a+b)
204 bracketOperation = leftear + leftear + datas[0] + operator[0]
205 + datas[1] + rightear + operator[1] + datas[2]
206 + rightear + operator[2] + leftear + datas[3]
207 + operator[3] + datas[4] + rightear;
208 break;
209 case 8:// (((a+b)+c)+d)+e
210 bracketOperation = leftear + leftear + leftear + datas[0]
211 + operator[0] + datas[1] + rightear + operator[1]
212 + datas[2] + rightear + operator[2] + datas[3]
213 + rightear + operator[3] + datas[4];
214 break;
215 case 9:// a+(a+b+c)+e
216 bracketOperation = datas[0] + operator[0] + leftear + datas[1]
217 + operator[1] + datas[2] + operator[2] + datas[3]
218 + rightear + operator[3] + datas[4];
219 break;
220 }
221 break;
222 }
223 return bracketOperation;
224 }
225
226 }
CreateExercises
时间： 2024-03-21 02:26:56