C++ 是什么意思？运行时？
C++ 运行时完成了哪些活动？
What are all the activities done by C++ runtime?
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C++ 运行时完成了哪些活动？
What are all the activities done by C++ runtime?
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它处理应用程序的启动和关闭，以及它运行所需的核心服务 - 例如初始化堆栈和静态变量，以及提供堆和默认内存分配器。
It handles startup and shutdown of your application, and the core services it needs to run - things like initialising the stack and static variables, and providing the heap and default memory allocators.
来自 Wikipedia：
术语 C 运行时库在某些平台上用于指代一组基础库，可以以可动态链接的形式与操作系统（带或不带头文件）一起分发，或者与 C 编译器一起分发。有时使用的另一个术语是 libc。并非任何库都称为运行时库；本文中的运行时是指与编译器相关的运行时支持包，编译器被理解为使语言完整。运行时支持不仅提供 C 标准库函数，还可能提供为 C 程序创建环境所需的其他材料，例如调用主函数之前的初始化，或提供 CPU 缺少的算术运算的子例程。 C 编译器生成的代码需要这些。
From Wikipedia:
The term C run-time library is used on some platforms to refer to a set of base libraries, which may be distributed in dynamically linkable form with an operating system (with or without header files), or distributed with a C compiler. Another term sometimes used is libc. Not just any library is called the run-time library; run time in this context means the run-time support package associated with a compiler which is understood to make a language complete. The run-time support provides not only the C standard library functions, but possibly other material needed create an environment for the C program, such as initialization prior to the invocation of the main function, or subroutines to provide arithmetic operations missing from the CPU that are needed by code generated by the C compiler.