C Runtime C run-time

As the name implies, C run-time is the C program runtime environment, short-form CRT
The C runtime consists of the following parts: 1) the entry and exit functions of the Bootstrapper (main) and its dependent functions 2) the implementation of the standard functions of C 3) the encapsulation and implementation of the I/O function 4) heap encapsulation and implementation 5) C language of the implementation of the special features 6) Debug function 7) Other
Runtime is platform-dependent, where the platform refers to the operating system which can be understood as a C language program and an abstraction layer of different operating system platforms
* Not all C program operations must be implemented through the CRT * Not all operations in the CRT are defined in the C language

C Runtime C run-time