基于Java编写简易的算式测试程序

import java.util.*;

public class Calculate {

     public static void main(String[] args) {

         //接受用户输入

         Scanner sc = new Scanner(System.in);

         System.out.println( "请输入题目的数量：" );

         int n = sc.nextInt();

         //result保存算式答案，right保存答对题数，accuracy保存准确率

         int result = 0 , right = 0 ;

         double accuracy;

         //开始计时

         long startTime = System.currentTimeMillis();

         //打印加减乘三种算式

         Random r = new Random();

         for ( int i = 0 ; i < n; i++) {

             int i1 = r.nextInt( 50 );

             int i2 = r.nextInt( 50 );

             int i3 = r.nextInt( 3 );

             //判断进行哪种运算

             if (i3 == 0 ) {

                 System.out.println(i1 + "-" + i2 + "=" );

                 result = i1 - i2;

             } else if (i3 == 1 ) {

                 System.out.println(i1 + "+" + i2 + "=" );

                 result = i1 + i2;

             } else {

                 System.out.println(i1 + "*" + i2 + "=" );

                 result = i1 * i2;

             }

             //输出正确与否信息，同时判断是否增加答对题数

             int a = sc.nextInt();

             if (a == result) {

                 System.out.println( "答对了！" );

                 right += 1 ;

             } else {

                 System.out.println( "答错了，继续加油！" );

             }

         }

         //计算准确率

         accuracy = (right * 1.0 / n) * 100 ;

         //结束计时

         long endTime = System.currentTimeMillis();

         //输出成绩

         System.out.print( "恭喜你，一共答对了" + right + "题" + "," + "正确率:" + accuracy + "%" + "," + "用时：" + (endTime - startTime) / 1000 + "秒" );

         //关闭资源的使用，可不加

         sc.close();

     }

}