国外某嵌入式公司的面试题,这段C语言代码很多人都做错了。

在C说话程序开辟中,程序员能够在定义数组时对其初始化,而且容许只对一片面元素初始化,未显式给定初值的元素将被置零,比方:

int a[5] = {1, 2};这行C说话代码实行结束后,数组 a 中的元素将是 1,2,0,0,0。这是C说话数组的根基常识点。不过遗憾的是,从我昨天在圈子里共享的一个口试题来看,仍有片面C说话程序员觉得未显式给定初值的数组元素值是不决义的。底下是国际某嵌入式公司的口试题,有人在 * 上发问,感受对照故意思:

国外某嵌入式公司的面试题,这段C语言代码很多人都做错了。国际某嵌入式公司的口试题

题外话

宛若我每次共享少许口试题都有人觉得我是“孔乙己”,纠结这些口试题没故意义。不过真的没故意义吗?开始要明白的是,说明口试题并不是推重口试题中的C说话代码写法,而是谈论其背地潜藏的底子常识。比方,要是读者不行清晰C说话数组初始化方面的性质,是无法得出这个题目的精确谜底的。

国外某嵌入式公司的面试题,这段C语言代码很多人都做错了。题外话

究竟上,许多公司雇用时,都有少许口试题大概笔试题看起来很独特,很不合乎尺度的开辟范例,因而有些程序员就觉得做如许的口试题是彻底没故意义的。不过实在呢,这些题目可能来自公司里面的某个名目的某次重大 bug,短短的口试时代完备的形貌该 bug 不太可能,只好将其空洞成一个看起来很“偏僻”的口试题,考查求职者。

要是求职者底子不踏实,往后可能还会犯一样的错误,这是不容许的。是以,关于我们求职者来说,平时拿到这些口试题,开始想到的应当是它背地潜藏哪些常识点,查漏补缺才是正途。

说明

有许多乐于着手的读者看到题目后,登时在本人的建筑上编写关联C说话代码并编译实行,不过宛若获得了两种谜底,以下所示,这是怎么回事呢?

1, 0, 0, 0, 0// 大概1, 0, 1, 0, 0

实在,本题要紧考查两个常识点,一是前方提到的C说话数组初始化,再即是C说话语句“序列点(sequence point)”的观点了。(关于“序列点”,能够参考我以前的文章:《这段C说话代码固然简略,但其隐含的题目,许多程序员都轻易纰漏》)

国外某嵌入式公司的面试题,这段C语言代码很多人都做错了。这是怎么回事呢?

出现两种后果的缘故是,int a[5]={a[2]=1}; 实在C说话尺度并没有明白定义(起码在C99中云云)。就本题而言,唯独明白的是 a[0] 会被设为 1,其余的全部将不行确定后果。

C说话程序员应当对C尺度有所打听,那本题刚好即是一个契机。

开始,有读者怀疑int a[5]={a[2]=1}; 在C说话中是否正当。以是先查阅关联尺度:数组 a 是一个部分变量,由于在尺度中提到:

6.7.8 InitializationAll the expressions in an initializer for an object that has static storage duration shall be constant expressions or string literals.

意思是,全部的领有静态存储的初始化表白式必需应用常量表白式初始化,本题中数组 a 应用 a[2]=1 初始化,是以 a 肯定没有静态存储空间,也即只能是部分变量。

国外某嵌入式公司的面试题,这段C语言代码很多人都做错了。a 肯定没有静态存储空间

部分变量 a 的用途域也包括它本人的初始化,是以 int a[5]={a[2]=1}; 的写法在C说话中应当是正当的,这一点可参照尺度:

6.2.4 Storage durations of objectsFor such an object that does not have a variable length array type, its lifetime extends from entry into the block with which it is associated until execution of that block ends

不过,固然这种写法是正当的,上述C说话代码仍然不行确定数组 a 的后果,这在尺度中也是有形貌的,请看:

6.7.9 InitializationThe evaluations of the initialization list expressions are indeterminately sequenced with respect to one another and thus the order in which any side effects occur is unspecified.

马虎是,初始化列表表白式的计较挨次是不确定的,是以时代产生的“副用途(side effect)”也是不行确定的。

国外某嵌入式公司的面试题,这段C语言代码很多人都做错了。为何这段C说话代码会产生两个后果?

稍稍总结一下,应当就能清晰为何这段C说话代码会产生两个后果了。究竟上,C说话表白式:

int a[5] = {a[2]=1};就相配于 int a[5]={1}; 和 a[2]=1; 两个表白式的组合,表白式 int a[5] = {1},将使得数组 a 中元素被初始化为

1, 0, 0, 0, 0

而 a[2] =1 则会将数组 a 的 2 号元素设为 1,终极获得后果

1, 0, 1, 0, 0

不过毕竟末了会产生哪一个后果呢?遗憾的是,根据上头的谈论, int a[5]={1}; 和 a[2]=1; 两个表白式的副用途产生挨次是不确定的,也即是说,我们不行确定 a[2]=1; 毕竟是在 int a[5]={1}; 以前,或是往后实行,这就可能造成出现两个后果,两个后果都不行觉得是错的。

小结

正如前方所说,“独特的”口试题也能够赞助我们查漏补缺,为打听决这个口试题,我们乃至还翻阅了少许C尺度。在此时代,相信我们的手艺人不知,鬼不觉就晋升了。

 

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