What does a C language program consist of?

A C language program is composed of a main function and several other functions. The function is the basic unit of the C program. The called function can be the system The provided library functions can also be functions defined by users according to their needs.

A function is a piece of code that can be reused to complete a certain function independently. It can receive data passed by the user or not. Functions that receive user data must specify parameters when defining them. Functions that do not receive user data do not need to be specified. Based on this, functions can be divided into parameterized functions and parameterless functions.

The process of encapsulating a code segment into a function is called function definition.

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