如何使用条件运算符？ [英] How do I use the conditional operator?

问题描述

我一直想知道如何用C ++兼容的语言编写 A？B：C

我认为它的工作类似：（伪代码）

 如果A> B 
 C = A 
 Else 
 C = B 
  

解决方案

它的工作原理是这样的：

 （条件）？ true-clause：false-clause 
  

它最常用于赋值操作，好。三元运算符？是缩短if-else子句的一种方法，也称为其他语言的立即if语句（ IIf ，true-clause，false-clause）在VB中，例如）。

例如：

  bool Three = SOME_VALUE; 
 int x =三？ 3：0; 
  

与

相同

  bool Three = SOME_VALUE; 
 int x; 
 if（Three）
 x = 3; 
 else 
 x = 0; 
  

I've always wondered how to write the "A ? B : C" syntax in a C++ compatible language.

I think it works something like: (Pseudo code)

If A > B
   C = A
Else
   C = B

Will any veteran C++ programmer please help me out?

解决方案

It works like this:

(condition) ? true-clause : false-clause

It's most commonly used in assignment operations, although it has other uses as well. The ternary operator ? is a way of shortening an if-else clause, and is also called an immediate-if statement in other languages (IIf(condition,true-clause,false-clause) in VB, for example).

For example:

bool Three = SOME_VALUE;
int x = Three ? 3 : 0;

is the same as

bool Three = SOME_VALUE;
int x;
if (Three)
    x = 3;
else
    x = 0;

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