a++怎么还是3？？？
a++怎么还是3？？？
5 回答
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我不得不再说一遍：这个题是错的！
你先要明白前置自增运算符和后置自增运算符是怎么回事：
通常说，a++是先取值后运算，++a是先运算后取值。实际上这里涉及“运算符”、“表达式”和“语句”的概念。
++ 是一个“自增运算符”，自增运算符有两种形式：前置自增(++a)和后置自增(a++)。
运算符和操作数合起来就是一个表达式（a++、++a都是表达式，a就是操作数）。注意：每一个表达式本身都有值（和其类型），有的表达式还有“副作用”。比如自增表达式的副作用就是使其操作数自增1。那么自增运算表达式的值是什么呢？ a++ 的值就是 a 的值，而 ++a 的值等于 a+1。
表达式后面加上一个分号才是一个完整的“语句”。
还有一个关键内容：前面说使操作数自增1是自增表达式的副作用，那么这个副作用什么时候发生呢？ 准确地说是在“序列点”后保证会发生。 序列点这个概念比较复杂，简单地说：“语句结束时”是一个序列点。这序列点之前的运算符的副作用，在执行到这点以后都保证会发生。注意并不是在这一点之后就突然发生的，这些副作用可能在序列点前的任何一个位置发生，C标准只是规定在序列点之后这些副作用必须已经发生了。
复合表达式中的运算顺序是由运算符优先级决定的，但参与运算的操作数的求值顺序是未定的。
在a+b%a-b/a+a*b-a++这个大复合表达式中，根据运算符优先级，a++先算，这个子表达式的值是3没有错（因为是先求值再自增），但a++的副作用在什么时候发生是并不确定的，且其他的a是什么时候取值也是不确定的。我只知道在整个语句结束之后a的值肯定是4，但a也可能在取第一个a的值时就已经是4了......也可能第一个a还是3，第二个a就是4了......也可能所有的a都是3......这一切都是有可能的，所以这段代码的行为就是未定义的。
对于写复合表达式，一般建议：如果表达式改变了一个操作数的值，那就不要在这个复合表达式中再次使用这个操作数。除非你能确定“改变值”和“使用值”的先后顺序。 在这个例子中，显然你不能确定顺序。
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