今天六一，晚上突然想到了陈子晴。她很爱用我的电脑计算，老让我出题目，烦了我想到编个程序自动产生题目。六一送她一份小小的礼物，就几行代码：
import java.util.Random;
import java.util.Scanner;
/**
* @author djob2008
* @time 2009-5-28上午09:53:32
*/
public class Counter {
public static void main(String[] args) {
Random random = new Random();
int i = 0;
int j = 0;
int tag = 0;
while (tag != 50) {
i = random.nextInt(20);
j = random.nextInt(10);
System.out.println(i + "+" + j + "=");
Scanner in = new Scanner(System.in);
if (in.nextInt() == (i + j)) {
System.out.println("你计对了！");
} else
System.out.println("错了");
tag++;
}
}
}
结果测试：
0+3=3你计对了！10+7=17你计对了！13+6=16错了15+2=17你计对了！14+4=18你计对了！15+4=
