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...模式很简单，就是付费应用，一开始只有iOS版，价格为0.99美元，用户支付一次性费用后即可免费收发信息，WhatsApp则通过用户的付费来维持稳定而可靠的通讯服务，随着用户量的不断增长，WhatsApp逐步开发完善了多个不同手机平...

...permissive] typeof关键字是GNU C拓展，编译选项需要加 -std=gnu99 （或-std=gnu++11 对应C++11标准）才能被识别。类似于c++11的decltype关键字。 2604编译错误

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