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@ -7,186 +7,186 @@ import java.util.Random;
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import java.util.Set;
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import java.util.Set;
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public abstract class BaseQuestionGenerator {
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public abstract class BaseQuestionGenerator {
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protected Random random = new Random();
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protected Random random = new Random();
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public abstract Question generateQuestion(int index);
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public abstract Question generateQuestion(int index);
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protected void generateOperands(int[] operands, int min, int max) {
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protected void generateOperands(int[] operands, int min, int max) {
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for (int i = 0; i < operands.length; i++) {
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for (int i = 0; i < operands.length; i++) {
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operands[i] = random.nextInt(max - min + 1) + min;
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operands[i] = random.nextInt(max - min + 1) + min;
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}
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}
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}
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}
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protected void generateOperations(int[] operations, int operationTypes) {
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protected void generateOperations(int[] operations, int operationTypes) {
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for (int i = 0; i < operations.length; i++) {
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for (int i = 0; i < operations.length; i++) {
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operations[i] = random.nextInt(operationTypes);
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operations[i] = random.nextInt(operationTypes);
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}
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}
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}
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}
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protected void appendOperator(StringBuilder sb, int operation) {
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protected void appendOperator(StringBuilder sb, int operation) {
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switch (operation) {
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switch (operation) {
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case 0: sb.append(" + "); break;
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case 0: sb.append(" + "); break;
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case 1: sb.append(" - "); break;
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case 1: sb.append(" - "); break;
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case 2: sb.append(" × "); break;
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case 2: sb.append(" × "); break;
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case 3: sb.append(" ÷ "); break;
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case 3: sb.append(" ÷ "); break;
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}
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}
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}
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}
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protected boolean isValidAnswer(double answer) {
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protected boolean isValidAnswer(double answer) {
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return !(answer < 0 || Double.isNaN(answer) || Double.isInfinite(answer));
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return !(answer < 0 || Double.isNaN(answer) || Double.isInfinite(answer));
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}
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}
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// 修改：使用double进行精确计算，只在最后保留小数
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// 修改：使用double进行精确计算，只在最后保留小数
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protected double calculateExpression(double[] values, int[] operations) {
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protected double calculateExpression(double[] values, int[] operations) {
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List<Double> numbers = new ArrayList<>();
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List<Double> numbers = new ArrayList<>();
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List<Integer> ops = new ArrayList<>();
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List<Integer> ops = new ArrayList<>();
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for (double value : values) numbers.add(value);
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for (double value : values) numbers.add(value);
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for (int operation : operations) ops.add(operation);
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for (int operation : operations) ops.add(operation);
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processMultiplicationAndDivision(numbers, ops);
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processMultiplicationAndDivision(numbers, ops);
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return processAdditionAndSubtraction(numbers, ops);
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return processAdditionAndSubtraction(numbers, ops);
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}
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}
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protected double calculateWithoutParentheses(int[] operands, int[] operations) {
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protected double calculateWithoutParentheses(int[] operands, int[] operations) {
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double[] doubleOperands = new double[operands.length];
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double[] doubleOperands = new double[operands.length];
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for (int i = 0; i < operands.length; i++) {
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for (int i = 0; i < operands.length; i++) {
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doubleOperands[i] = operands[i];
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doubleOperands[i] = operands[i];
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}
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return calculateExpression(doubleOperands, operations);
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}
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}
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return calculateExpression(doubleOperands, operations);
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}
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protected double calculateWithoutParentheses(List<Integer> numbers, List<Integer> ops) {
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protected double calculateWithoutParentheses(List<Integer> numbers, List<Integer> ops) {
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double[] doubleNumbers = new double[numbers.size()];
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double[] doubleNumbers = new double[numbers.size()];
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for (int i = 0; i < numbers.size(); i++) {
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for (int i = 0; i < numbers.size(); i++) {
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doubleNumbers[i] = numbers.get(i);
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doubleNumbers[i] = numbers.get(i);
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}
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int[] intOps = new int[ops.size()];
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for (int i = 0; i < ops.size(); i++) {
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intOps[i] = ops.get(i);
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}
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return calculateExpression(doubleNumbers, intOps);
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}
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}
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private void processMultiplicationAndDivision(List<Double> numbers, List<Integer> ops) {
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int[] intOps = new int[ops.size()];
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for (int i = 0; i < ops.size(); i++) {
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for (int i = 0; i < ops.size(); i++) {
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int op = ops.get(i);
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intOps[i] = ops.get(i);
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if (op == 2 || op == 3) {
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double left = numbers.get(i);
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double right = numbers.get(i + 1);
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double result = performOperation(left, right, op);
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numbers.set(i, result);
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numbers.remove(i + 1);
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ops.remove(i);
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i--;
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}
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}
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}
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}
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private double processAdditionAndSubtraction(List<Double> numbers, List<Integer> ops) {
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return calculateExpression(doubleNumbers, intOps);
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double result = numbers.get(0);
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}
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for (int i = 0; i < ops.size(); i++) {
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private void processMultiplicationAndDivision(List<Double> numbers, List<Integer> ops) {
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int op = ops.get(i);
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for (int i = 0; i < ops.size(); i++) {
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double nextNum = numbers.get(i + 1);
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int op = ops.get(i);
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result = performOperation(result, nextNum, op);
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if (op == 2 || op == 3) {
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}
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double left = numbers.get(i);
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double right = numbers.get(i + 1);
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double result = performOperation(left, right, op);
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// 修改：只在最后一步进行四舍五入保留2位小数
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numbers.set(i, result);
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return Math.round(result * 100) / 100.0;
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numbers.remove(i + 1);
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ops.remove(i);
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i--;
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}
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}
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}
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}
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private double performOperation(double left, double right, int operation) {
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private double processAdditionAndSubtraction(List<Double> numbers, List<Integer> ops) {
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switch (operation) {
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double result = numbers.get(0);
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case 0: return left + right;
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case 1: return left - right;
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case 2: return left * right;
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case 3:
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if (right == 0) return Double.NaN;
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// 修改：直接进行除法，不在这里保留小数
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return left / right;
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default: return left;
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}
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}
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protected Question generateOptions(String questionText, double answer, String level) {
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String[] options = new String[4];
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Set<String> usedValues = new HashSet<>();
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// 修改：判断是否为整数的逻辑
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boolean isIntegerAnswer = Math.abs(answer - Math.round(answer)) < 1e-10;
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String correctAnswer = formatAnswer(answer, isIntegerAnswer);
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options[0] = correctAnswer;
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usedValues.add(correctAnswer);
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generateWrongOptions(options, usedValues, answer, isIntegerAnswer);
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shuffleArray(options);
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int correctIndex = findCorrectIndex(options, correctAnswer);
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for (int i = 0; i < ops.size(); i++) {
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return new Question(questionText, options, correctIndex, level);
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int op = ops.get(i);
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double nextNum = numbers.get(i + 1);
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result = performOperation(result, nextNum, op);
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}
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}
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private void generateWrongOptions(String[] options, Set<String> usedValues,
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// 修改：只在最后一步进行四舍五入保留2位小数
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double answer, boolean isIntegerAnswer) {
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return Math.round(result * 100) / 100.0;
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for (int i = 1; i < 4; i++) {
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}
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String wrongAnswer;
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int attempts = 0;
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do {
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double wrongValue = generateWrongValue(answer, isIntegerAnswer);
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wrongAnswer = formatAnswer(wrongValue,
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Math.abs(wrongValue - Math.round(wrongValue)) < 1e-10);
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attempts++;
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} while (usedValues.contains(wrongAnswer) && attempts < 20);
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options[i] = wrongAnswer;
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usedValues.add(wrongAnswer);
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}
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}
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private double generateWrongValue(double answer, boolean isIntegerAnswer) {
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double offset = (random.nextDouble() * 5) + 1;
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if (isIntegerAnswer) {
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int intAnswer = (int) Math.round(answer);
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int intOffset = random.nextInt(10) + 1;
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double wrongValue = random.nextBoolean() ?
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intAnswer + intOffset : Math.max(1, intAnswer - intOffset);
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return wrongValue;
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} else {
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double wrongValue = random.nextBoolean() ? answer + offset : answer - offset;
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// 修改：错误选项也保留2位小数
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return Math.round(wrongValue * 100) / 100.0;
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}
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}
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// 修改：格式化答案，只在最后一步处理小数位数
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private String formatAnswer(double answer, boolean isInteger) {
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if (isInteger) {
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return String.valueOf((int) Math.round(answer));
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} else {
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// 确保显示2位小数，即使末尾是0
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return String.format("%.2f", answer);
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}
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}
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private void shuffleArray(String[] array) {
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for (int i = array.length - 1; i > 0; i--) {
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int j = random.nextInt(i + 1);
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String temp = array[i];
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array[i] = array[j];
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array[j] = temp;
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}
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}
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private int findCorrectIndex(String[] options, String correctAnswer) {
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private double performOperation(double left, double right, int operation) {
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for (int i = 0; i < options.length; i++) {
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switch (operation) {
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if (options[i].equals(correctAnswer)) return i;
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case 0: return left + right;
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}
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case 1: return left - right;
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return 0;
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case 2: return left * right;
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}
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case 3:
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if (right == 0) return Double.NaN;
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// 修改：直接进行除法，不在这里保留小数
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return left / right;
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default: return left;
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}
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}
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protected Question generateOptions(String questionText, double answer, String level) {
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String[] options = new String[4];
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Set<String> usedValues = new HashSet<>();
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// 修改：判断是否为整数的逻辑
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boolean isIntegerAnswer = Math.abs(answer - Math.round(answer)) < 1e-10;
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String correctAnswer = formatAnswer(answer, isIntegerAnswer);
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options[0] = correctAnswer;
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usedValues.add(correctAnswer);
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generateWrongOptions(options, usedValues, answer, isIntegerAnswer);
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shuffleArray(options);
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int correctIndex = findCorrectIndex(options, correctAnswer);
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return new Question(questionText, options, correctIndex, level);
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}
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private void generateWrongOptions(String[] options, Set<String> usedValues,
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double answer, boolean isIntegerAnswer) {
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for (int i = 1; i < 4; i++) {
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String wrongAnswer;
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int attempts = 0;
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do {
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double wrongValue = generateWrongValue(answer, isIntegerAnswer);
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wrongAnswer = formatAnswer(wrongValue,
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Math.abs(wrongValue - Math.round(wrongValue)) < 1e-10);
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attempts++;
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} while (usedValues.contains(wrongAnswer) && attempts < 20);
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options[i] = wrongAnswer;
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usedValues.add(wrongAnswer);
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}
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}
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private double generateWrongValue(double answer, boolean isIntegerAnswer) {
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double offset = (random.nextDouble() * 5) + 1;
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if (isIntegerAnswer) {
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int intAnswer = (int) Math.round(answer);
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int intOffset = random.nextInt(10) + 1;
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double wrongValue = random.nextBoolean() ?
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intAnswer + intOffset : Math.max(1, intAnswer - intOffset);
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return wrongValue;
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} else {
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double wrongValue = random.nextBoolean() ? answer + offset : answer - offset;
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// 修改：错误选项也保留2位小数
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return Math.round(wrongValue * 100) / 100.0;
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}
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}
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// 修改：格式化答案，只在最后一步处理小数位数
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private String formatAnswer(double answer, boolean isInteger) {
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if (isInteger) {
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return String.valueOf((int) Math.round(answer));
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} else {
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// 确保显示2位小数，即使末尾是0
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return String.format("%.2f", answer);
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}
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}
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private void shuffleArray(String[] array) {
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for (int i = array.length - 1; i > 0; i--) {
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int j = random.nextInt(i + 1);
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String temp = array[i];
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array[i] = array[j];
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array[j] = temp;
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}
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}
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private int findCorrectIndex(String[] options, String correctAnswer) {
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for (int i = 0; i < options.length; i++) {
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if (options[i].equals(correctAnswer)) return i;
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}
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return 0;
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}
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}
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}
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hnu202326010221
cc4a338998