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你可能喜欢另解，c/c++有趣的经典笔试题:不用判断语句求得两个整数的最大值 - 博客频道 - CSDN.NET
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分类：c/c++
另解，c/c++笔试题:不用判断语句求得两个整数的最大值
& & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & jiese1990
There are two int variables: x and y, don’t use “if”, “? :”, “switch”or other judgementstatements, find out the biggest one of the two numbers.
有两个int型的整数：x，y；不使用&if&,&? :&,&switch&等判断语句！找出a、b中最大的数！
过两天要去笔试，于是这两天开始看些往年的笔试题；
今天看到已一个比较有趣的笔试题！第一眼看到这个题目就觉得特有意思！于是就拼命的想求解答案！想了那么20来分钟，还是没有想到求解方案，很想很想查看答案，但是，心想，要是自己能独立解出，介个题，那肯定会很爽很爽的...于是乎终于憋出了个答案，兴奋不已啊！
int biger(int x,int y)
bool b=x&y; //我想这个应该不算是judgement statements；x&y应该叫做比较表达式吧！而题中也为要求不能使用&，&的比较表达式吧！
return b*x+(!b)*y;
看到题目后的几个思路
思路1:不用判断语句，那么可以通过位运算来求的较大者！我们有a=x&y;b=x|y;c=~x;d=~y;
& & & & & 问题是，我要怎么通过a,b,c,d;和运算符来求得结果；想了半天，未果；于是寻求其它思路。
思路2:有没有什么数学表达式可以直接求得结果！最有可能通过使用x+y,x-y两个式子来求的结果！想了许久，又未果！
思路3:可以通过一个值b来代表x和y那个大,这个数必须要莫是0(代表y更大)，要么是1（代表x更大）！然后通过b*x+(!b)*y求的结果！然后很自然的可以想到用一个bool变量！然后就想出了如上答案！
想到答案后，果然很爽很爽...
然后查看答案，本以为答案会是跟我想的一样！事实往往不会是我想当然的那样（我已经习惯了这一点）！
我发现答案更神奇，居然跟我思路2是一路货色（可惜我没有想到啊）！:( ( a + b ) + abs( a - b ) ) / 2;
可是很快我就觉得abs（）不能用，我觉得它的实现就是用了判断语句！于是剖开源码：（果不其然）
int __cdecl abs (int number)
return( number&=0 ? number : -number );
该方法是变相的使用了&? :&;
我想一个数的正负不就是由最高位决定，如果最高位为1，那么就是负数，如果最高位为0,那么就是正数！很明显可以通过这点求绝对值！
但我没心思去想怎么求绝对值了，于是就直接google找到了答案！
这个思路的答案在，该文章中有源码！
然后我直接google:不用判断语句，获得两个数中的较大者;
找到了很多帖子讨论这个面试题！
找到了很多解决方法，但是没有找到和我想到的答案类似的答案！所以记录下来！
排名：千里之外
（17）（1）（3）（4）（1）（1）（5）（0）（1）（2）后使用快捷导航没有帐号？
本贴相关题目
Prices at the producer level are only 1.3 percent higher now than a year ago and are going down, even though floods in the Midwest and drought in the South are hurting crops and therefore raised corn and soybean prices.Athan a year ago and are going down, even though floods in the Midwest and drought in the South are hurting crops and therefore raisedBthan those of a year ago and are going down, even though floods in the Midwest and drought in the South are hurting crops and therefore raisingCthan a year ago and are going down, despite floods in the Midwest and drought in the South, and are hurting crops and therefore raisingDas those of a year ago and are going down, even though floods in the Midwest and drought in the South hurt crops and therefore raiseEas they were a year ago and are going down, despite floods in the Midwest and drought in the South, and are hurting crops and therefore raising
正确答案: B
更多相关帖子
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Prices at the producer level are only 1.3 percent higher now than a year ago and are going down, even though floods in the Midwest and drought in the South are hurting crops and therefore raised corn and soybean prices.
A than a year ago and are going down, even though floods in the Midwest and drought in the South are hurting crops and therefore raised&&分析A选项
B than those of a year ago and are going down, even though floods in the Midwest and drought in the South are hurting crops and therefore raising&&分析B选项
C than a year ago and are going down, despite floods in the Midwest and drought in the South. and are hurting crops and therefore raising&&分析C选项
D as those of a year ago and are going down, even though floods in the Midwest and drought in the South hurt crops and therefore raise&&分析D选项
E as they were a year ago and are going down, despite floods in the Midwest and drought in the South, and are hurting crops and therefore raising&&分析E选项
这里的those of 为什么不能省略呢
看成两个是状语的比较
而OG这一题为什么又可以省略呢
93、Heating-oil prices are expected to be higher this year than last because refiners are paying about $5 a barrel more for crude oil than they were last year.
(A)& & Heating-oil prices are expected to be higher this year than last because refiners are paying about $5 a barrel more for crude oil than they were
(B)& & Heating-oil prices are expected to rise higher this year over last because refiners pay about $5 a barrel for crude oil more than they did
(C)& & Expectations are for heating-oil prices to be higher this year than last year’s because refiners are paying about $5 a barrel for crude oil more than they did
(D)& & It is the expectation that heating-oil prices will be higher for this year over last because refiners are paying about $5 a barrel more for crude oil now than what they were
(E)& & It is expected that heating-oil prices will rise higher this year than last year’s because refiners pay about $5 a barrel for crude oil more than they did
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之前回答过这个问题　但是不知道是否正确　
第一个例子now 是副词　与一般的时间状语有区别　如果改成　Prices at the producer level are only 1.3 percent higher this year than a year ago. 就应该是正确的
第二句话第一是省略了year 因为不引起歧义　第二比较对象都有相应的状语结构　所以正确
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再顶一下 谢谢楼上答复 还有其他吗
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第一题思考：
A：raised应该是raising, 删除
B：好像对了，留着
C：despite后面不应该是个句子，（你可能写的不对，那个地方不应该是句号，请纠正）
DE：as应该是than
其实这里AB比较都对，A是 B是prices vs those
A：看起来没问题留着
B：rise higher有问题，但是不是很严重，留着
C：expect用了名词，复杂，不好，放心删除
D：it is the ...that绝对复杂，放心删除
A vs B，to be higher &to rise higher.B不好，删除。
A里面比较：this year vs last (year) 和refunere are&&vs they were.
B：refiner pay vs they did, 比较都对了。
解决你的问题：在比较中，时间可以比较时间，动词可以比较动词，系动词可以比较系动词，
然后，主谓可以比较主谓（这时候通常用that of 或者those of),
those of的使用取决于比较对象而不是 省略问题。
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本帖最后由 elusive 于
11:51 编辑
第一题思考：
A：raised应该是raising, 删除
B：好像对了，留着
C：despite后面不应该是个句子，（你可能写的不对，那个地方不应该是句号，请纠正）
DE：as应该是than
其实这里AB比较都对，A是 B是prices vs those
A：看起来没问题留着
B：rise higher有问题，但是不是很严重，留着
C：expect用了名词，复杂，不好，放心删除
D：it is the ...that绝对复杂，放心删除
A vs B，to be higher &to rise higher.B不好，删除。
A里面比较：this year vs last (year) 和refunere are&&vs they were.
B：refiner pay vs they did, 比较都对了。
解决你的问题：在比较中，时间状语可以比较时间状语，主谓比主谓，主系比较主系。后面的主语通常是those of/that of,如果不是人。是人的话，they，he, she...
those of的使用取决于比较对象而不是 省略问题。
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楼主提了个好问题！为了不误人子弟，我是引用曼哈顿论坛的讨论。
RON认为第一题的A选项中的比较结构是正确的，即比较时间状语“now”和a year ago“。
该选项的错误在与后半句的”raised“。
原帖链接：/gmat/forums/post117480.html#p117480
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楼主提了个好问题！为了不误人子弟，我是引用曼哈顿论坛的讨论。
RON认为第一题的A选项中的比较结构是正确 ...
谢谢！同意！
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楼主提了个好问题！为了不误人子弟，我是引用曼哈顿论坛的讨论。
RON认为第一题的A选项中的比较结构是正确 ...
感谢 ！刚好在困惑这两道题！
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据说编OG和编答案的不是一伙人!
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don't forget—the OG answer keys are usually incomplete, and often incorrect.
the official PROBLEMS are essentially flawless, but the official answer keys are not. (GMAC's all-stars, the people who write the problems, do not w GMAC 'outsources' that work to people of lesser talent, presumably to cut costs.)
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