2020.10.13二柱子与他的计算题
作者：互联网
代码：
public class Caculate03 {
private static int grade;
private static int number = 30;
private static int range;
private static String[] operator = new String[100];
private static int operatorNumber;
private static int[] randomOperator = new int[100];
private static int[] randomNumber = new int[100];
private static String[] sum = new String[100];
private static String[] formula = new String[100];
private static String[] formula2 = new String[100];
private static String[] errorQuestionKey = new String[100];
private static int error = 0;//错题数量
private static int correct = 0;//正确数量
public static void Initialize() {
Scanner sc = new Scanner(System.in);
System.out.print("请输入出题个数:");
number = sc.nextInt();
System.out.print("请输入操作数取值范围：");
range = sc.nextInt();
}
//打印
public static void print() {
for (int i = 0; i < number; i++) {
System.out.println(formula[i]);
}
}
//生成随机数
public static void generateRandomNumber() {
long seed = System.currentTimeMillis();
Random r = new Random(seed);
for (int i = 0; i < number*operatorNumber; i++) {
randomNumber[i] = r.nextInt(range);
}
}
//生成四则运算
public static void generateOperation() {
Random r = new Random();
for (int i = 0; i < (operatorNumber-1)*number; i++) {
randomOperator[i] = r.nextInt(4);
switch (randomOperator[i]) {
case 0:
operator[i] = "+";
break;
case 1:
operator[i] = "-";
break;
case 2:
operator[i] = "*";
break;
case 3:
operator[i] = "/";
break;
default:
System.out.println("Error1!");
break;
}
}
}
//组合
public static void combination() {
int n = 0, k =0;
Random r = new Random();
for (int i = 0; i < operatorNumber * number; i = i+operatorNumber){
for (int j = i; j < i+operatorNumber; j++) {
if (j != (i+operatorNumber-1)) {
while (true) {
if ("/".equals(operator[n])) {
if (randomNumber[j + 1] == 0 || randomNumber[j] % randomNumber[j + 1] != 0) {
randomNumber[j + 1] = r.nextInt(range);
randomNumber[j] = r.nextInt(range);
} else {
break;
}
} else {
break;
}
}
if (j == i){
formula[k] = String.valueOf(randomNumber[j])+operator[n];
formula2[k] = String.valueOf(randomNumber[j])+operator[n];
} else {
formula[k] += String.valueOf(randomNumber[j])+operator[n];
formula2[k] += String.valueOf(randomNumber[j])+operator[n];
}
n++;
} else if(j == i+operatorNumber-1) {
formula[k] += String.valueOf(randomNumber[j]);
formula2[k] += String.valueOf(randomNumber[j]);
}
}
if (grade == 4){
formula[k] = bracket(formula[k]);
}
k++;
}
}
public static String bracket(String formula) {
long seed = System.currentTimeMillis();
Random r = new Random(seed);
int leftBracket, rightBracket;
int a, b;
String formula2="";
while(true){
a = r.nextInt(operatorNumber-2)+1;
b = r.nextInt(operatorNumber-2)+1;
if (a>b){
leftBracket = b;
rightBracket = a;
break;
} else if (a<b){
leftBracket = a;
rightBracket = b;
break;
} else {
continue;
}
}
int k=0;
String temp="";
String[] numberStack = new String[operatorNumber];
String[] operatorStack = new String[operatorNumber];
operatorStack[0] = "#";
for (int i = 0; i < formula.length(); i++) {
if (formula.charAt(i) != '+' && formula.charAt(i) != '-' && formula.charAt(i) != '*' && formula.charAt(i) != '/' && i != formula.length() - 1) {
temp += formula.charAt(i);
continue;
} else if (i == formula.length() - 1) {
temp += formula.charAt(i);
numberStack[k] = temp;
} else {
numberStack[k] = temp;
operatorStack[k + 1] = String.valueOf(formula.charAt(i));
temp = "";
k++;
}
}
formula2 += numberStack[0];
for (int i = 1; i < operatorNumber; i++) {
if (i == leftBracket){
formula2 += operatorStack[i]+"("+numberStack[i];
} else if (i == rightBracket){
formula2 += operatorStack[i]+numberStack[i]+")";
} else {
formula2 += operatorStack[i]+numberStack[i];
}
}
return formula2;
}
//计算
public static void caculate() {
if (grade == 4){
for (int i = 0; i < number; i++) {
sum[i] = caculateString(formula[i]);
}
} else{
for (int i = 0; i < number; i++) {
sum[i] = caculateString(formula[i]);
}
}
}
//计算一个字符串算式
@NotNull
public static String caculateString(@NotNull String formula) {
int k=0;
int n=1;
String temp="";
//给定两个栈，一个存放数字，一个存放运算符
int[] numberStack = new int[operatorNumber];
int[] numberStack2 = new int[operatorNumber];
String[] operatorStack = new String[operatorNumber];
String[] operatorStack2 = new String[operatorNumber];
operatorStack[0] = "#";
for (int i = 0; i < formula.length(); i++) {
if (formula.charAt(i) != '+' && formula.charAt(i) != '-' && formula.charAt(i) != '*' && formula.charAt(i) != '/' && i != formula.length() - 1 &&formula.charAt(i)!='('&&formula.charAt(i)!=')') {
temp += formula.charAt(i);
continue;
} else if (i == formula.length() - 1) {
temp += formula.charAt(i);
numberStack[k] = Integer.parseInt(temp);
} else {
numberStack[k] = Integer.parseInt(temp);
operatorStack[k + 1] = String.valueOf(formula.charAt(i));
temp = "";
k++;
}
}
operatorStack2[0] = operatorStack[0];
numberStack2[0] = numberStack[0];
for (int i = 1; i < operatorNumber; i++) {
if ("*".equals(operatorStack[i])||"/".equals(operatorStack[i])) {
switch (operatorStack[i]) {
case "*":
numberStack2[n-1] = numberStack[i]*numberStack2[n-1];
break;
case "/":
numberStack2[n-1] = numberStack2[n-1]/numberStack[i];
break;
default:
System.out.println("Error2!");
break;
}
} else {
operatorStack2[n] = operatorStack[i];
numberStack2[n] = numberStack[i];
n++;
}
}
int i;
for (i = 1; i < n; i++) {
switch (operatorStack2[i]) {
case "+":
numberStack2[i] = numberStack2[i]+numberStack2[i-1];
break;
case "-":
numberStack2[i] = numberStack2[i-1]-numberStack2[i];
break;
default:
System.out.println("Error3!");
break;
}
}
return String.valueOf(numberStack2[n-1]);
}
public static String caculateString02(String formula){
String formula2="";
String temp="";
String result;
for (int i = 0; i < formula.length(); i++) {
if (formula.charAt(i) == '('){
for (int j = i+1; j < formula.length(); j++) {
if (formula.charAt(j) != ')'){
formula2 += String.valueOf(formula.charAt(j));
} else {
i = j;
break;
}
}
System.out.println(formula2);
formula2 = caculateString(formula2);
temp += formula2;
}else {
temp += String.valueOf(formula.charAt(i));
}
}
result = caculateString(temp);
return result;
}
//在线答题
public static void answerQuesetion() throws IOException {
String result;
Scanner sc = new Scanner(System.in);
for (int i = 0; i < number; i++) {
System.out.print((i+1)+". "+formula[i]+"=");
result = sc.nextLine();
if (result.equals(sum[i])){
correct++;
} else {
/*
如果用户输入答案不正确，则将题目录入至错题库
*/
generateWrongQuestion(formula[i]);
errorQuestionKey[error] = sum[i];
error++;
}
}
System.out.println("正确"+correct+",错误"+error);
System.out.println("------------------------------------");
System.out.println(" 正确答案");
for (int i = 0; i < number; i++) {
System.out.println(" "+(i+1)+". "+sum[i]);
}
System.out.println("------------------------------------");
}
//讲题目录入至错题库
public static void generateWrongQuestion(String formula) throws IOException {
OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("E:\\WrongTopicSet.txt"));
osw.write(formula);
osw.flush();
osw.close();
}
/*
功能：
1.将存入粗题库中的错题进行再次显示
2.重做
*/
public static void printWrongQuestion() throws IOException {
String result;
String line;
int i = 0;
Scanner sc = new Scanner(System.in);
BufferedReader br = new BufferedReader(new FileReader("E:\\WrongTopicSet.txt"));
while((line = br.readLine()) != null) {
System.out.println(line);
result = sc.nextLine();
if (result.equals(errorQuestionKey[i])) {
System.out.println("回答正确，你真的太棒了");
} else {
System.out.println("回答错误，要继续努力哦");
}
i++;
}
}
public static void inputOperatorNumber(int n) {
Scanner sc = new Scanner(System.in);
Random r = new Random();
if (n == 2){
operatorNumber = 2;
} else {
System.out.print("请选择操作数个数：");
operatorNumber = sc.nextInt();
}
}
public static void main(String[] args) throws IOException {
char choice = 'Y';
boolean bool = true;
Scanner sc = new Scanner(System.in);
Initialize();
System.out.print("请输入年级:");
grade = sc.nextInt();
//选择操作数量
inputOperatorNumber(grade);
//生成计算题
generateRandomNumber();
generateOperation();
combination();
caculate();//生成计算题后计算答案
//System.out.println("这里有没有问题呢？");
while(true){
if (choice == 'Y' || choice == 'y') {
generateRandomNumber();
generateOperation();
combination();
caculate();
answerQuesetion();
} else if(choice == 'n' || choice == 'N') {
printWrongQuestion();
} else {
System.exit(0);
}
System.out.println("------------------------------------");
System.out.println(" Y or y 进行下一套题训练");
System.out.println(" N or n 进行错题训练");
System.out.println(" 其他任意键 退出");
System.out.println("------------------------------------");
System.out.print("请选择：");
choice = sc.next().charAt(0);
System.out.println("------------------------------------");
}
}
}
标签：13,String,计算题,int,private,static,2020.10,new,randomNumber 来源： https://www.cnblogs.com/lmygq1728/p/14160781.html