C语言结构体对齐也是老生常谈的话题了。基本上是面试题的必考题。内容虽然很基础，但一不小心就会弄错。写出一个struct，然后sizeof，你会不会经常对结果感到奇怪？sizeof的结果往往都比你声明的变量总长度要大，这是怎么回事呢？-C language structure alignment is also commonplace topic. Is basically a must face questions exam. Although the content is very basic, but believe it will be a mistake. Write a struct, then sizeof, you will not often be surprised with the results? sizeof results are often better than the total length of the variable you declare to be big, this is how it happened?