test-paper-system/src/HighMaker.java

package Program;

public class HighMaker extends QuestionMaker {
    private static final char[] operators = {'+', '-', '*', '/'};
    private static final String[] functions = {"sin", "cos", "tan"};

    /**
     * 为式子添加三角函数
     * @return 添加三角函数后的式子
     */

    @Override

    protected String makeOneQuestion() {
        StringBuilder question = new StringBuilder();
        boolean check=false;

        int count=rand.nextInt(4)+2;
        int trigFunction=rand.nextInt(count);

        for(int i=0;i<count;i++){
            if(i>0){
                char operator=operators[rand.nextInt(operators.length)];
                question.append(" ").append(operator).append(" ");
            }

            if(i==trigFunction&&!check){
                String function=functions[rand.nextInt(functions.length)];
                int angle=rand.nextInt(100);
                question.append(function).append("(").append(angle).append(")");
                check=true;
            }else{
                int random=randomMaker();
                question.append(random);
            }
        }

        if(!check){
            String function=functions[rand.nextInt(functions.length)];
            char operator=operators[rand.nextInt(operators.length)];
            int angle=rand.nextInt(100);
            question.append(" ").append(operator).append(" ").append(function)
                    .append("(").append(angle).append(")");
        }
        return question.toString();
    }

    @Override

    protected boolean checkQuestion(String question) {
        // 检查是否包含三角函数
        return question.contains("sin(") || question.contains("cos(")
                || question.contains("tan(");
    }
}