写作方式的不同和QUOT;若"声明 [英] Different ways of writing the "if" statement

问题描述

我看到写的如果语句的不同方式。

你喜欢，为什么哪一个？

例1：

 如果（VAL％2 == 1 ）{输出=号是奇;}其他{输出=号甚至是;} 
  

例2：

 如果（VAL％2 == 1）
 {
输出=号是奇; 
} 
，否则
 {
输出=号甚至是; 
} 
  

例3：

 如果（VAL％2 == 1）
输出=号是奇; 
，否则
输出=号甚至是; 
  

示例4：

 如果（VAL％2 == 1）{
输出=号是奇; 
}其他{
输出=号甚至是; 
} 
  

类似的问题：

< BLOCKQUOTE>

为什么认为是不好的做法，忽略大括号？

解决方案

有关这样的情况下，也条件运算符：

 输出=（VAL％2 == 1）？ 号是奇：号甚至是; 
  

如果你一定要使用一个如果我会使用版本2或4版，这取决于你的支撑风格的其余部分。 （在工作中我使用4;个人项目我用2）最主要的是，有括号甚至围绕单个语句

BTW，测试校验它的咯。更快的使用方法：

  IF（（VAL&安培; 1）== 1）
  

I have seen different ways of writing an if statement.

Which one do you prefer and why?

Example 1:

if (val % 2 == 1){output = "Number is odd";}else{output = "Number is even";}

Example 2:

if (val % 2 == 1)
{
    output = "Number is odd";
}
else
{
   output = "Number is even";
}

Example 3:

if (val % 2 == 1)
output = "Number is odd";
else
output = "Number is even";

Example 4:

if (val % 2 == 1){
output = "Number is odd";
} else {
output = "Number is even";
}

Similar question:

Why is it considered a bad practice to omit curly braces?

解决方案

For cases like this, there's also the conditional operator:

output = (val % 2 == 1) ? "Number is odd" : "Number is even";

If you're definitely going to use an "if" I'd use version 2 or version 4, depending on the rest of your bracing style. (At work I use 4; for personal projects I use 2.) The main thing is that there are braces even around single statements.

BTW, for testing parity it's slightly quicker to use:

if ((val & 1) == 1)

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