Math_Learning/src/Generator/Pri_g_ques.java

package Generator;

import java.util.Random;

public class Pri_g_ques implements G_ques{
    private Random ra= new Random();

    @Override
    public String g_question() {
        int count=ra.nextInt(4)+2;
        StringBuilder question = new StringBuilder();
        int count_bracket=0;
        for (int i=0;i<count;i++) {
            if (i > 0) {
                question.append(" ").append(g_operator()).append(" ");
            }
            if (i!=count-1&&ra.nextDouble()<0.4){
                question.append("(");
                count_bracket++;
            }
            question.append(ra.nextInt(100) + 1);
        }
        if (count_bracket!=0){
            question.append(")".repeat(Math.max(0, count_bracket)));
        }
        return question.toString();
    }

    @Override
    public String g_type(){
        return "小学";
    }

    @Override
    public char g_operator(){
        char[] op={'+','-','*','/'};
        return op[ra.nextInt(op.length)];
    }

    @Override
    public String add_brackets(StringBuilder s,int count){
        return  s.toString();
    }
}