From 91cd06060a888ba94d014077f9b94c4a649f7338 Mon Sep 17 00:00:00 2001 From: xiyu <913780279@qq.com> Date: Sat, 13 Oct 2018 20:02:37 +0800 Subject: [PATCH 01/11] =?UTF-8?q?=E7=AC=AC=E4=B8=80=E6=AC=A1=E6=8F=90?= =?UTF-8?q?=E4=BA=A4?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .classpath | 7 ++ .gitignore | 1 + .project | 17 +++ PSP3042/MathExam3042.java | 234 ++++++++++++++++++------------------- README.md | 26 ++--- src/MathExam3042.java | 140 ++++++++++++++++++++++ teset_result/10-13-44.png | Bin 0 -> 13690 bytes test/MathExam3042Test.java | 47 ++++++++ 8 files changed, 342 insertions(+), 130 deletions(-) create mode 100644 .classpath create mode 100644 .gitignore create mode 100644 .project create mode 100644 src/MathExam3042.java create mode 100644 teset_result/10-13-44.png create mode 100644 test/MathExam3042Test.java diff --git a/.classpath b/.classpath new file mode 100644 index 0000000..4ce4a88 --- /dev/null +++ b/.classpath @@ -0,0 +1,7 @@ + + + + + + + diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ae3c172 --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +/bin/ diff --git a/.project b/.project new file mode 100644 index 0000000..d0c715a --- /dev/null +++ b/.project @@ -0,0 +1,17 @@ + + + Imp_201621013042 + + + + + + org.eclipse.jdt.core.javabuilder + + + + + + org.eclipse.jdt.core.javanature + + diff --git a/PSP3042/MathExam3042.java b/PSP3042/MathExam3042.java index 09e80e3..982ba79 100644 --- a/PSP3042/MathExam3042.java +++ b/PSP3042/MathExam3042.java @@ -1,117 +1,117 @@ -import java.io.File; -import java.io.FileOutputStream; -import java.io.IOException; -import java.io.OutputStream; -import java.util.Scanner; - -public class MathExam3042 { - private static int n,grade; - static StringBuffer Topic = new StringBuffer(); - static StringBuffer Answer= new StringBuffer(); - static final String[] sign = {"+","-"}; - static final String[] sign2 = {"*","/"}; - public static void main(String[] args) throws IOException { - if (args.length == 0) { - throw new IllegalArgumentException("不能输入零个参数"); - } - String str = args[0].replaceFirst("^0*", ""); - if(str.length()>3){ - throw new IllegalArgumentException("参数过大"); - } - for(int i = 0;(str.charAt(i)<'0' || str.charAt(i++)>'9') && i< str.length();i++){ - throw new IllegalArgumentException("不要输入非数字"); - } - n = Integer.parseInt(args[0]); - grade = Integer.parseInt(args[1]); - if(grade==1) { - Exam(); - writeTo(); - System.out.println("一年级加减法请查看out.txt"); - } - if (grade==2) { - Exam2(); - writeTo(); - System.out.println("二年级乘除法请查看out.txt"); - } - } - private static void Exam() { - int num1,num2,result=0,select; - for(int i=0; i<=n; i++) { -//100以内加减 - num1 = (int) (Math.random() * 100); - num2 = (int) (Math.random() * 100); - select = (int) (Math.random() * 2); - String s = sign[select]; - switch (s) { - case "+": - result=num1+num2; - break; - case "-": - if (num13){ + throw new IllegalArgumentException("参数过大"); + } + for(int i = 0;(str.charAt(i)<'0' || str.charAt(i++)>'9') && i< str.length();i++){ + throw new IllegalArgumentException("不要输入非数字"); + } + n = Integer.parseInt(args[0]); + grade = Integer.parseInt(args[1]); + if(grade==1) { + Exam(); + writeTo(); + System.out.println("一年级加减法请查看out.txt"); + } + if (grade==2) { + Exam2(); + writeTo(); + System.out.println("二年级乘除法请查看out.txt"); + } + } + private static void Exam() { + int num1,num2,result=0,select; + for(int i=0; i<=n; i++) { +//100以内加减 + num1 = (int) (Math.random() * 100); + num2 = (int) (Math.random() * 100); + select = (int) (Math.random() * 2); + String s = sign[select]; + switch (s) { + case "+": + result=num1+num2; + break; + case "-": + if (num13){ + throw new IllegalArgumentException("参数过大"); + } + for(int i = 0;(str.charAt(i)<'0' || str.charAt(i++)>'9') && i< str.length();i++){ + throw new IllegalArgumentException("不要输入非数字"); + } + n = Integer.parseInt(args[0]); + grade = Integer.parseInt(args[1]); + if(grade==1) { + Exam(); + writeTo(); + System.out.println("一年级加减法请查看out.txt"); + } + if (grade==2) { + Exam2(); + writeTo(); + System.out.println("二年级乘除法请查看out.txt"); + } + } + public static void getRandom(){ + num1 = (int) (Math.random() * 100); + num2 = (int) (Math.random() * 100); + select = (int) (Math.random() * 2); + } + private static void Exam() { + int result=0; + getRandom(); + for(int i=0; i<=n; i++) { + getRandom(); + String fuhao = sign[select]; + switch (fuhao) { + case "+": + result=add(); + break; + case "-": + result=sub(); + break; + default: + System.out.println("unsuppoted sign！"); + } + Topic.append("("+i+")"+num1+" "+fuhao+" "+num2+"\r\n"); + Answer.append("("+i+")"+num1+" "+fuhao+" "+num2+" "+"= "+result+"\r\n"); + } + } + public static void Exam2() throws IOException{ + int result=0,remain=0; + for(int i=0; i<=n; i++) { + num1 = (int) (Math.random() * 100); + num2 = (int) (Math.random() * 100); + select = (int) (Math.random() * 2); + String fuhao = sign2[select]; + switch (fuhao) { + case "*": + result = multiply(); + break; + case "/": + result = div(); + remain = remainder(); + break; + default: + System.out.println("unsuppoted sign！"); + } + Topic.append("("+i+")"+num1+" "+fuhao+" "+num2+"\r\n"); + if(fuhao == "*") + Answer.append("("+i+")"+num1+" "+"*"+" "+num2+" "+"= "+result+"\r\n"); + else if (remain!=0) + Answer.append("("+i+")"+num1+" "+"/"+" "+num2+" "+"= "+(int)result+"..."+remain+"\r\n"); + else + Answer.append("("+i+")"+num1+" "+"/"+" "+num2+" "+"= "+result+"\r\n"); + } + } + public static int add() { + return num1+num2; + } + public static int sub() { + if (num1_tZz|Uof(BM&wx8EOZV4Q>`RS*#o z7uV(2z^_R55}Hl`fDL(lL#>#Sxd8wZyafeczG3UY12p?T7`p1P9lR zVq8<4=f>t*i=#C^?i50&J2AY>@K|-O;9fJt>@+)JSR2a|JSZpiw!}nMdQAxm`g#|GF)0}l;a`}^on5|7O zB9kNflb>`3=QQq(ET98>4F&tW-r!Sh^&jCc{Joy$hL*675P+w9w?)&t#Q3CIl33~+ zqG6}vAc<2Z4~-~GeLNr}FZZ&JVHv$PSNP6t?|nT72?09+6udaa9Id^01)0fUdHue% z(~rqrtxofi@mNpPSoU@j8BUVvHkz9K5QH%Y#Xshg)K-7Z2dP8Ai^h{YNzJB`7Dtkl 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assertEquals(5, MathExam3042.add()); + } + + @Test + public void testSub() { + math.set(5, 3); + assertEquals(2, MathExam3042.sub()); + } + + @Test + public void testMultiply() { + math.set(2, 3); + assertEquals(6, MathExam3042.multiply()); + } + + @Test + public void testDiv() { + math.set(6, 3); + assertEquals(2, MathExam3042.div()); + } + + @Test + public void testRemainder() { + math.set(17, 8); + assertEquals(1, MathExam3042.remainder()); + } + @Test(expected = IllegalArgumentException.class) + public void Div() { + math.set(6,0); + MathExam3042.div(); + } +} -- Gitee From 04bb283260b436e8150ec1ab01189648917c2a13 Mon Sep 17 00:00:00 2001 From: xiyu <913780279@qq.com> Date: Sat, 13 Oct 2018 20:08:36 +0800 Subject: [PATCH 02/11] =?UTF-8?q?=E7=AC=AC=E4=BA=8C=E6=AC=A1=E6=8F=90?= =?UTF-8?q?=E4=BA=A4?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- teset_result/{10-13-44.png => 10-13-19-44.png} | Bin teset_result/10-13-20-06.png | Bin 0 -> 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81f37f411e7020cb35bc6908b3f3e0822ffd3185 Mon Sep 17 00:00:00 2001 From: xiyu <913780279@qq.com> Date: Sat, 13 Oct 2018 20:18:00 +0800 Subject: [PATCH 03/11] =?UTF-8?q?=E7=AC=AC=E4=B8=89=E6=AC=A1=E6=8F=90?= =?UTF-8?q?=E4=BA=A4?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- src/MathExam3042.java | 1 + teset_result/10-13-20-16.png | Bin 0 -> 10840 bytes 2 files changed, 1 insertion(+) create mode 100644 teset_result/10-13-20-16.png diff --git a/src/MathExam3042.java b/src/MathExam3042.java index 781f63b..8002589 100644 --- a/src/MathExam3042.java +++ b/src/MathExam3042.java @@ -34,6 +34,7 @@ public class MathExam3042 { System.out.println("二年级乘除法请查看out.txt"); } } + //获取随机数 public static void getRandom(){ num1 = (int) (Math.random() * 100); num2 = (int) (Math.random() * 100); diff --git a/teset_result/10-13-20-16.png b/teset_result/10-13-20-16.png new file mode 100644 index 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zN~)Sr_;Fyys(zyh(;N!d?6nn09gm<8t~4Y>NXEThm{U@JnYB)5fy2S$YCTAx)_m6x zsSt!UD$D$J8KeT9`&$a_*OjrWpEz!AX$=fU)b&{L{6o~2k{!bejsT=mo95RKSOob;Eg04_ncaV{FBVOf5~pS{>dXulLZhKp`dSXQ0P z)ol@H>X0fh`MlCw0(CgJUU<7TJqFnZ&g2@9iBZ=(2${|)Y?CWl4O%2H0Y~bpYKyH^ zfBqtj|86MUX(UPaz+qIta?>Bgj`E-n5_CMecNLFgiPI-TwCt6{Vty`)r)C}!2yHBv zB)0H~-qJB)U)~}2=k7+&&buGoWwH#g$x3^v*a7UlFaKmDDWo-}bwCu{m^LX=f$~Q6 zu8)Xh9U~2;#OHrhRi^%~dy@@$y<0wkC%oVZlYH}ELf;YWjeF@z`Ja;OKb_b8S_<0j zG!#<*;(<43S}^ke(0=-KXorW<=aIzR^wt1g%TW9R$?@)(|GBo9LH0}iU+KgDkE-$; a%tZTJIvf0J8)R=NAoW%LOQop3|Nj8Iw#)|r literal 0 HcmV?d00001 -- Gitee From b4ca65dae8a61da9b5ac24b55952c8169cbbccda Mon Sep 17 00:00:00 2001 From: xiyu <913780279@qq.com> Date: Sat, 27 Oct 2018 16:33:53 +0800 Subject: [PATCH 04/11] =?UTF-8?q?=E7=AC=AC=E4=B8=80=E6=AC=A1=E6=8F=90?= =?UTF-8?q?=E4=BA=A4?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- MathExam.java | 301 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 301 insertions(+) create mode 100644 MathExam.java diff --git a/MathExam.java b/MathExam.java new file mode 100644 index 0000000..2b8ea94 --- /dev/null +++ b/MathExam.java @@ -0,0 +1,301 @@ +import java.io.File; +import java.io.FileOutputStream; +import java.io.IOException; +import java.io.OutputStream; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Random; +import java.util.Stack; +import java.util.regex.Pattern; + +public class MathExam { + public static int n,grade; //输入题目数，年级 + public static int num1,num2,select; + static StringBuffer Topic = new StringBuffer();//题目 + static StringBuffer Answer= new StringBuffer();//答案 + static final String[] sign = {"+","-"}; + static final String[] sign2 = {"*","/"}; + static final String[] sign3 = {"*","/","+","-"}; + //定义符号的优先级 + private static final Map priority = new HashMap(); + static { + priority.put('+', 1); + priority.put('-', 1); + priority.put('*', 2); + priority.put('/', 2); + priority.put('(', 0); + } + //主函数 + public static void main(String[] args) throws IOException { + if (args.length == 0) { + throw new IllegalArgumentException("不能输入零个参数"); + } + String str = args[0].replaceFirst("^0*", ""); + if(str.length()>3){ + throw new IllegalArgumentException("参数过大"); + } + for(int i = 0;(str.charAt(i)<'0' || str.charAt(i++)>'9') && i< str.length();){ + throw new IllegalArgumentException("不要输入非数字"); + } + //输入题目数，班级 + n = Integer.parseInt(args[0]); + grade = Integer.parseInt(args[1]); + if(grade==1) { + Exam(); + writeTo(); + System.out.println("一年级加减法请查看out.txt"); + } + if (grade==2) { + Exam2(); + writeTo(); + System.out.println("二年级乘除法请查看out.txt"); + } + if (grade==3) { + Exam3(); + writeTo(); + System.out.println("三年级四则运算请查看out.txt"); + } + } + //生成一二年级随机数 + public static void getRandom(){ + num1 = (int) (Math.random() * 100); + num2 = (int) (Math.random() * 100); + select = (int) (Math.random() * 2); + } + //产生中缀表达式 + public static String getExpression() { + char[] operator=new char[]{'+','-','*','/'}; + Random random=new Random(); + int select=random.nextInt(3)+2; //随机产生2-4个运算符 + int[] num=new int[select+1]; //定义一个数组 + String expression=new String(); + for(int j=0;j<=select;j++){ + num[j]=random.nextInt(100)+1; //3-5个数字 + } + for(int j=0;j queue = new ArrayList(); //定义队列,用于存储数字以及最后的后缀表达式 + List stack = new ArrayList();//定义栈，用于存储运算符 + char[] charArr = infix.trim().toCharArray(); //字符数组 ,用于拆分数字或符号 + String standard = "*/+-()";//判定标准 将表达式中会出现的运算符写出来 + char ch = '&'; //在循环中用来保存 字符数组的当前循环变量的 这里仅仅是初始化一个值 没有意义 + int len = 0; //用于记录字符长度 + for (int i = 0; i < charArr.length; i++) { + ch = charArr[i]; //保存当前迭代变量 + if(Character.isDigit(ch)) { //如果当前变量为 数字 + len++; + }else if(Character.isSpaceChar(ch)){ //如果当前变量为 空格 支持表达式中有空格出现 + if(len>0) { //若为空格代表 一段结束 ，就可以往队列中存入了【例如100 * 2 100后面有空格 就可以将空格之前的存入队列了】 + queue.add(String.valueOf(Arrays.copyOfRange(charArr, i - len, i))); //往 队列存入截取的字符串 + len = 0; //长度置空 + } + continue; + }else if(standard.indexOf(ch) != -1) { //如果是上面标准中的 任意一个符号 + if(len>0) { //长度也有 + queue.add(String.valueOf(Arrays.copyOfRange(charArr, i - len, i))); //说明符号之前的可以截取下来做数字 + len = 0; + } + if(ch=='(') { //如果是左括号 + stack.add(ch);//将左括号 放入栈中 + continue; + } + if(!stack.isEmpty()) { //如果栈不为empty + int size = stack.size() - 1; //获取栈的大小-1 即代表栈最后一个元素的下标 + boolean flag = false; //设置标志位 + while (size >= 0 && ch == ')' && stack.get(size) != '(') { //若当前ch为右括号，则 栈里元素从栈顶一直弹出，直到弹出到 左括号 + queue.add(String.valueOf(stack.remove(size))); + size--; //size-- 保证下标永远在栈最后一个元素【栈中概念：指针永远指在栈顶元素】 + flag = true; + } + while (size >= 0 && !flag && priority.get(stack.get(size)) >= priority.get(ch)) { + //若取得不是（）内的元素，并且当前栈顶元素的优先级>=对比元素 那就出栈插入队列 + queue.add(String.valueOf(stack.remove(size))); //同样 此处也是remove()方法，既能得到要获取的元素，也能将栈中元素移除掉 + size--; //size-- 保证下标永远在栈最后一个元素【栈中概念：指针永远指在栈顶元素】 + } + } + if(ch != ')') {//若当前元素不是右括号 + stack.add(ch); //就要保证这个符号 入栈 + }else { + stack.remove(stack.size() - 1); //否则就要出栈 栈内符号 + } + } + if(i == charArr.length - 1) { //如果已经走到了 中缀表达式的最后一位 + if(len > 0) { + queue.add(String.valueOf(Arrays.copyOfRange(charArr, i - len+1, i+1))); + } + int size = stack.size() - 1; + while (size >= 0) { + queue.add(String.valueOf(stack.remove(size))); + //一直将栈内 符号全部出栈 并且加入队列中 【最终的后缀表达式是存放在队列中的，而栈内最后会被弹空】 + size--; + } + } + } + //return queue.stream().collect(Collectors.joining(",")); //将队列中元素以,分割 返回字符 + String equation = queue.toString(); + return equation; + } + //将后缀表达式进行运算计算出结果 + public static boolean isNumeric(String str){ + Pattern pattern = Pattern.compile("[0-9]*"); + return pattern.matcher(str).matches(); + } + public static int dealEquation(String equation) { + int op1 = 0;// 记录出栈数字 + int op2 = 0;// 记录出栈数字 + int result = 0; + int sum=0; + Stack stack = new Stack();// 创建栈对象 + String[] arr = equation.split(" "); // 对传入的字符串通过空格进行分割，并传入数组 + for (int i = 0; i < arr.length; i++) { // 对字符进行判断，如果为数字，则入栈；如果为运算符，则进行运算。 + if (isNumeric(arr[i])) { + stack.push(arr[i]); + continue; + } + if (arr[i] == "+" || arr[i] == "-" || arr[i] == "*" || arr[i] == "/") { + op1 = Integer.parseInt((String) stack.pop()); + op2 = Integer.parseInt((String) stack.pop()); + switch (arr[i]) { + case "+": + result = op1+op2; + stack.push(result + ""); + break; + case "-": + result = op1-op2; + + stack.push(result + ""); + break; + case "*": + result = op2*op1; + stack.push(result + ""); + break; + case "/": + result = op2/op1; + stack.push(result + ""); + break; + default: + break; + } + } + sum=result; + } + return sum; + } + //写文件方法 + public static void writeTo() throws IOException{ + File file = new File("d:\\out.txt"); + if (!file.exists()){ + File parent = file.getParentFile(); + if (parent != null && !parent.exists()) { + parent.mkdirs(); + } + file.createNewFile(); + } + OutputStream out = new FileOutputStream(file); + byte[] question=Topic.toString().getBytes(); + byte[] answer=Answer.toString().getBytes(); + out.write(question); + out.write(System.lineSeparator().getBytes()); + out.write(answer); + out.close(); + } +} + -- Gitee From 2042535d686a7539dde70d84001a1d3520807cc1 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E5=8D=81=E4=B8=80=E5=95=8A?= <1012970490@qq.com> Date: Sat, 27 Oct 2018 16:41:17 +0800 Subject: [PATCH 05/11] =?UTF-8?q?=E7=AC=AC=E4=BA=8C=E6=AC=A1=E6=8F=90?= =?UTF-8?q?=E4=BA=A4?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- MathExam.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/MathExam.java b/MathExam.java index 2b8ea94..ef49175 100644 --- a/MathExam.java +++ b/MathExam.java @@ -279,7 +279,7 @@ public class MathExam { } return sum; } - //写文件方法 + // 写文件方法 public static void writeTo() throws IOException{ File file = new File("d:\\out.txt"); if (!file.exists()){ -- Gitee From 98b5b85c89ca3d01be8a33e03645ffdf0162c726 Mon Sep 17 00:00:00 2001 From: sue_sue <1250848326@qq.com> Date: Sat, 27 Oct 2018 16:43:12 +0800 Subject: [PATCH 06/11] =?UTF-8?q?=E7=AC=AC=E4=B8=89=E6=AC=A1=E6=8F=90?= =?UTF-8?q?=E4=BA=A4?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- MathExam.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/MathExam.java b/MathExam.java index ef49175..ea8b7e0 100644 --- a/MathExam.java +++ b/MathExam.java @@ -12,7 +12,7 @@ import java.util.Stack; import java.util.regex.Pattern; public class MathExam { - public static int n,grade; //输入题目数，年级 + public static int n,grade; // 输入题目数，年级 public static int num1,num2,select; static StringBuffer Topic = new StringBuffer();//题目 static StringBuffer Answer= new StringBuffer();//答案 -- Gitee From 6b680ac2f2f3edde10239e2e6765348f02ed8526 Mon Sep 17 00:00:00 2001 From: sue_sue <1250848326@qq.com> Date: Sun, 28 Oct 2018 16:17:58 +0800 Subject: [PATCH 07/11] =?UTF-8?q?=E7=AC=AC=E5=9B=9B=E6=AC=A1=E6=8F=90?= =?UTF-8?q?=E4=BA=A4?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- MathExam.java | 52 ++++++++++++++++++--------------------------------- 1 file changed, 18 insertions(+), 34 deletions(-) diff --git a/MathExam.java b/MathExam.java index ea8b7e0..5eefee4 100644 --- a/MathExam.java +++ b/MathExam.java @@ -26,7 +26,6 @@ public class MathExam { priority.put('-', 1); priority.put('*', 2); priority.put('/', 2); - priority.put('(', 0); } //主函数 public static void main(String[] args) throws IOException { @@ -175,61 +174,46 @@ public class MathExam { List queue = new ArrayList(); //定义队列,用于存储数字以及最后的后缀表达式 List stack = new ArrayList();//定义栈，用于存储运算符 char[] charArr = infix.trim().toCharArray(); //字符数组 ,用于拆分数字或符号 - String standard = "*/+-()";//判定标准 将表达式中会出现的运算符写出来 - char ch = '&'; //在循环中用来保存 字符数组的当前循环变量的 这里仅仅是初始化一个值 没有意义 - int len = 0; //用于记录字符长度 + String standard = "*/+-";//判定标准 + char ch = '&'; //在循环中用来保存字符数组的当前循环变量 + int len = 0; for (int i = 0; i < charArr.length; i++) { - ch = charArr[i]; //保存当前迭代变量 - if(Character.isDigit(ch)) { //如果当前变量为 数字 + ch = charArr[i]; + if(Character.isDigit(ch)) { //如果当前变量为数字 len++; - }else if(Character.isSpaceChar(ch)){ //如果当前变量为 空格 支持表达式中有空格出现 - if(len>0) { //若为空格代表 一段结束 ，就可以往队列中存入了【例如100 * 2 100后面有空格 就可以将空格之前的存入队列了】 - queue.add(String.valueOf(Arrays.copyOfRange(charArr, i - len, i))); //往 队列存入截取的字符串 - len = 0; //长度置空 + }else if(Character.isSpaceChar(ch)){ //如果当前变量为空格 + if(len>0) { //若为空格代表一段结束 ，往队列中存入了 + queue.add(String.valueOf(Arrays.copyOfRange(charArr, i - len, i))); //往队列存入截取的字符串 + len = 0; } continue; - }else if(standard.indexOf(ch) != -1) { //如果是上面标准中的 任意一个符号 - if(len>0) { //长度也有 - queue.add(String.valueOf(Arrays.copyOfRange(charArr, i - len, i))); //说明符号之前的可以截取下来做数字 + }else if(standard.indexOf(ch) != -1) { //是上面标准中的任意一个符号 + if(len>0) { + queue.add(String.valueOf(Arrays.copyOfRange(charArr, i - len, i))); len = 0; } - if(ch=='(') { //如果是左括号 - stack.add(ch);//将左括号 放入栈中 - continue; - } - if(!stack.isEmpty()) { //如果栈不为empty + if(!stack.isEmpty()) { int size = stack.size() - 1; //获取栈的大小-1 即代表栈最后一个元素的下标 boolean flag = false; //设置标志位 - while (size >= 0 && ch == ')' && stack.get(size) != '(') { //若当前ch为右括号，则 栈里元素从栈顶一直弹出，直到弹出到 左括号 - queue.add(String.valueOf(stack.remove(size))); - size--; //size-- 保证下标永远在栈最后一个元素【栈中概念：指针永远指在栈顶元素】 - flag = true; - } while (size >= 0 && !flag && priority.get(stack.get(size)) >= priority.get(ch)) { - //若取得不是（）内的元素，并且当前栈顶元素的优先级>=对比元素 那就出栈插入队列 - queue.add(String.valueOf(stack.remove(size))); //同样 此处也是remove()方法，既能得到要获取的元素，也能将栈中元素移除掉 - size--; //size-- 保证下标永远在栈最后一个元素【栈中概念：指针永远指在栈顶元素】 + //当前栈顶元素的优先级>=对比元素，出栈插入队列 + queue.add(String.valueOf(stack.remove(size))); + size--; //保证下标永远在栈最后一个元素 } } - if(ch != ')') {//若当前元素不是右括号 - stack.add(ch); //就要保证这个符号 入栈 - }else { - stack.remove(stack.size() - 1); //否则就要出栈 栈内符号 - } } - if(i == charArr.length - 1) { //如果已经走到了 中缀表达式的最后一位 + if(i == charArr.length - 1) { //如果已经走到了中缀表达式的最后一位 if(len > 0) { queue.add(String.valueOf(Arrays.copyOfRange(charArr, i - len+1, i+1))); } int size = stack.size() - 1; while (size >= 0) { queue.add(String.valueOf(stack.remove(size))); - //一直将栈内 符号全部出栈 并且加入队列中 【最终的后缀表达式是存放在队列中的，而栈内最后会被弹空】 + //一直将栈内符号全部出栈并且加入队列中 size--; } } } - //return queue.stream().collect(Collectors.joining(",")); //将队列中元素以,分割 返回字符 String equation = queue.toString(); return equation; } -- Gitee From 59b69846dc2c0b78395de6cfd6306aa464ee3212 Mon Sep 17 00:00:00 2001 From: sue_sue <1250848326@qq.com> Date: Sun, 28 Oct 2018 16:20:51 +0800 Subject: [PATCH 08/11] =?UTF-8?q?=E7=AC=AC=E4=BA=94=E6=AC=A1=E6=8F=90?= =?UTF-8?q?=E4=BA=A4?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- MathExam.java | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/MathExam.java b/MathExam.java index 5eefee4..cbacc1f 100644 --- a/MathExam.java +++ b/MathExam.java @@ -175,14 +175,14 @@ public class MathExam { List stack = new ArrayList();//定义栈，用于存储运算符 char[] charArr = infix.trim().toCharArray(); //字符数组 ,用于拆分数字或符号 String standard = "*/+-";//判定标准 - char ch = '&'; //在循环中用来保存字符数组的当前循环变量 + char ch = '&'; // 在循环中用来保存字符数组的当前循环变量 int len = 0; for (int i = 0; i < charArr.length; i++) { ch = charArr[i]; if(Character.isDigit(ch)) { //如果当前变量为数字 len++; }else if(Character.isSpaceChar(ch)){ //如果当前变量为空格 - if(len>0) { //若为空格代表一段结束 ，往队列中存入了 + if(len>0) { //若为空格代表一段结束 ，往队列中存入le queue.add(String.valueOf(Arrays.copyOfRange(charArr, i - len, i))); //往队列存入截取的字符串 len = 0; } -- Gitee From d47a09bfcff10f08367623f7541b4cd6e9870487 Mon Sep 17 00:00:00 2001 From: sue_sue <1250848326@qq.com> Date: Sun, 28 Oct 2018 16:23:18 +0800 Subject: [PATCH 09/11] =?UTF-8?q?=E7=AC=AC=E5=85=AD=E6=AC=A1=E6=8F=90?= =?UTF-8?q?=E4=BA=A4?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- MathExam.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/MathExam.java b/MathExam.java index cbacc1f..41ce1bf 100644 --- a/MathExam.java +++ b/MathExam.java @@ -14,7 +14,7 @@ import java.util.regex.Pattern; public class MathExam { public static int n,grade; // 输入题目数，年级 public static int num1,num2,select; - static StringBuffer Topic = new StringBuffer();//题目 + static StringBuffer Topic = new StringBuffer();// 题目 static StringBuffer Answer= new StringBuffer();//答案 static final String[] sign = {"+","-"}; static final String[] sign2 = {"*","/"}; -- Gitee From 5f20ead4fab6118a09dd27c1b60ab9b1c6887de8 Mon Sep 17 00:00:00 2001 From: xiyuzu <913780279@qq.com> Date: Sun, 28 Oct 2018 16:26:23 +0800 Subject: [PATCH 10/11] =?UTF-8?q?=E7=AC=AC=E4=B8=83=E6=AC=A1=E6=8F=90?= =?UTF-8?q?=E4=BA=A4?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- MathExam.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/MathExam.java b/MathExam.java index 41ce1bf..a35c219 100644 --- a/MathExam.java +++ b/MathExam.java @@ -81,7 +81,7 @@ public class MathExam { expression+=String.valueOf(num[select]+String.valueOf(" ")); return expression; } - //一年级 + // 一年级 private static void Exam() { int result=0; for(int i=0; i<=n; i++) { -- Gitee From 2e2194bc60edd801d8b1f1cfd801fe1ed9ed5441 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E5=8D=81=E4=B8=80=E5=95=8A?= <1012970490@qq.com> Date: Sun, 28 Oct 2018 16:29:56 +0800 Subject: [PATCH 11/11] =?UTF-8?q?=E7=AC=AC=E5=85=AB=E6=AC=A1=E6=8F=90?= =?UTF-8?q?=E4=BA=A4?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- MathExam.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/MathExam.java b/MathExam.java index a35c219..ac8c76e 100644 --- a/MathExam.java +++ b/MathExam.java @@ -101,7 +101,7 @@ public class MathExam { Answer.append("("+i+")"+num1+" "+fuhao+" "+num2+" "+"= "+result+"\r\n"); } } - //二年级 + // 二年级 public static void Exam2() throws IOException{ int result=0,remain=0; for(int i=0; i<=n; i++) { -- Gitee