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是否可以在if 语句中编写双重不等式？
前任：if (x <= y <= z) do stuff;
if (x <= y <= z) do stuff;
不——Objective-C 是 C 语言的超集，并且使用与 C 相同的语法用于if语句。您必须将其分成两个不等式：if (x <= y && y <= z).
if
if (x <= y && y <= z)