阅读以下代码和问题，回答问题，将解答填入答题纸的对应栏内。
1.【问题1】
对于代码1，写出下面的函数调用后x1、x2、x3和x4的值。
x1=f(1997)；
x2=f(2000)；
x3=f(2100)；
x4=f(2020)；
2.【问题2】
（1）写出代码2进行时输入为3的输出结果；
（2）写出代码2进行时输入为5的输出结果。
3.【问题3】
写出代码3运行后的输出结果。
正确答案及解析
正确答案
解析
【问题1】x1=3；x2=0；x3=2；x4=1
解析：1997：不满足0==yr%400，不满足!(yr%4)==1，所以返回D；
2000：满足0==yr%400，返回A；
2100：不满足0==yr%400，满足!(yr%4)==1，不满足0!=yr%100，返回C；
2020：不满足0==yr%400，满足!(yr%4)==1，满足0!=yr%100，返回B。
枚举类型中列出的每一个枚举符都对应着一个整数值，枚举类型实际上是一个整型符号常量的集合。当定义枚举类型时，枚举符都已经被系统隐含地赋予了一个整型值，默认情况下，第一个元素为0，第二个元素为1，依此类推。所以相应的A=0，B=1，C=2，D=3，故返回为：x1=3；x2=0；x3=2；x4=1。
【问题2】（1）Average!
poor!
Oops,Error
（2）Excellent!
Good!
解析：进入switch后会与各case匹配，从第一个匹配到的case开始执行，直到结束或者遇到break。
【问题3】0 1 0
0 2 0
0 2 1
1 0 1
1 2 0
1 2 1
解析：此题考察多重for循环再加上一个判定条件，i的取值为（0，1），j的取值为（0，1，2），k的取值为（0，1），只要按顺序找到i!=j且j!=k的组合即可。
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