C++ 简写 If Else
简写 If...Else（三元运算符）
还有一种简写 if else，称为**三元运算符**，因为它包含三个操作数。
它可以用来用一行代码替换多行代码，并且通常用来替换简单的 if else 语句。
语法
变量 = (条件) ? 表达式为真 : 表达式为假;
无需编写
你可以简单地写成
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