extern "C" int

extern "C" int是一种用于在C++代码中声明一个以C语言风格编译的函数或变量的方式。它的作用是告诉编译器将这部分代码按照C语言的规则进行编译，而不是C++的规则。这样做的目的是为了解决C和C++之间的兼容性问题，特别是在C++代码中调用C语言函数的情况下。通过使用extern "C"关键字，我们可以确保C++代码正确地调用被C编译器编译后的函数。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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