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33 lines
1.2 KiB
33 lines
1.2 KiB
import java.util.Random;
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/**
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* 小学题目生成器
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*/
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public class PrimaryQuestionGenerator extends AbstractQuestionGenerator {
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@Override
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public String generateQuestion(int[] operands, Random random) {
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StringBuilder question = new StringBuilder();
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// 小学题目：只能有+,-,*,/和()，严格按照附表-2要求
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question.append(operands[0]);
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for (int i = 1; i < operands.length; i++) {
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String op = BASIC_OPERATORS[random.nextInt(BASIC_OPERATORS.length)];
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// 随机添加括号，确保括号内也有运算符
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if (i < operands.length - 1 && random.nextBoolean()) {
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question.append(" ").append(op).append(" (").append(operands[i]);
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if (i + 1 < operands.length) {
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op = BASIC_OPERATORS[random.nextInt(BASIC_OPERATORS.length)];
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question.append(" ").append(op).append(" ").append(operands[++i]).append(")");
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} else {
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question.append(")");
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}
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} else {
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question.append(" ").append(op).append(" ").append(operands[i]);
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}
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}
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return question.toString();
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}
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}
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