c - else if 和 else {if} 的区别

Question

代码 A:

if () 
...
else {
   if (cond == 1) 
       /* do something */ 
}

代码 B:

if ()
...
else if (cond == 1) 
   /* do something */

代码A和代码B之间是否存在差异？

Answer 1

只有一个潜在的差异，通过稍微扩展的示例代码变得可见
(请原谅故意误导的缩进，这正是您在这种情况下需要牢记的问题):

if () 
...
else {
   if (cond == 1) 
       do_something();     /* executed on !1st and 2nd condition */
       do_somthing_else(); /* executed on !1st but unaffecated by 2nd condition */
}

if ()
...
else if (cond == 1) 
    do_something();       /* executed on !1st and 2nd condition */
    do_something_else();  /* ALWAYS executed */