```
import java.util.Scanner;
public class main {
public static void show() {
System.out.println("1.参数设置");
System.out.println("2.小学二年级口算题");
System.out.println("3.小学三年级口算题");
System.out.println("4.小学四年级口算题");
}
public static void showP() {
System.out.println("1.做新题");
System.out.println("2.做错题");
}
public static void main(String[] args) {
int nums = 30;//出题个数
int rangeMin = 0;//出题下限
int rangeMax = 10;//出题上限