import java.util.Random;
import java.util.Scanner;
public class Num {
public static void main(String[] args) {
System.out.println("练习题数:");
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
System.out.println("---------------------");
int c =0;
int result = 0;//计算结果
int count = 0;//正确题数
for (int j = 0; j
}