本文介绍了什么是'?'在C ++中做?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
int qempty()
{
return (f == r ? 1 : 0);
}
在上述代码段中,? 意思?我们可以用什么替换它?
In the above snippet, what does "?" mean? What can we replace it with?
推荐答案
这通常被称为,并且在使用时如下:
This is commonly referred to as the conditional operator, and when used like this:
condition ? result_if_true : result_if_false
...如果条件
计算 true
,表达式计算为 result_if_true
,否则计算为 result_if_false
。
... if the
condition
evaluates to true
, the expression evaluates to result_if_true
, otherwise it evaluates to result_if_false
.
这是句法糖,在这种情况下,它可以替换为
It is syntactic sugar, and in this case, it can be replaced with
int qempty()
{
if(f == r)
{
return 1;
}
else
{
return 0;
}
}
注意:请将
?:
作为三元运算符,因为它是语言中唯一的三元运算符他们正在使用。
Note: Some people refer to
?:
it as "the ternary operator", because it is the only ternary operator (i.e. operator that takes three arguments) in the language they are using.
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