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35 lines
1.0 KiB
35 lines
1.0 KiB
public class JuniorGenerator extends AbstractQuestionGenerator{
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public JuniorGenerator() {
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super(Level.JUNIOR);
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}
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@Override
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String generateExpression() {
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return generateSub(4);
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}
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private String generateSub(int depth) {
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if (depth == 0 || random.nextDouble() < 0.4) {
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return String.valueOf(getRandomNumber());
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}
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double r = random.nextDouble();
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if (r < 0.5) {
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String left = generateSub(depth - 1);
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String op = getRandomBinaryOp();
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String right = generateSub(depth - 1);
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return "(" + left + op + right + ")";
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} else if (r < 0.75) {
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String sub = generateSub(depth - 1);
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return "sqrt(" + sub + ")";
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} else {
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String sub = generateSub(depth - 1);
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return "(" + sub + ")^2";
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}
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}
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@Override
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boolean isValidForLevel(String expression) {
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return expression.contains("sqrt") || expression.contains("^2");
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}
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}
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