C language function is used to compile C language, and its library function is ctype.h, which is divided into classification function, mathematical function, catalog function, process function, diagnosis function, operation function and so on. "function" is translated from English function. In fact, function means both "function" and "function" in English.

Essentially, functions are used to accomplish certain functions. So the concept of function is easy to understand. The so-called function name is to give the function a name. A function is a mathematical function if it is used to perform mathematical operations.

Related knowledge:

C language is the most popular and widely used process-oriented advanced programming language in the world. C language is obviously superior to other high-level languages when it is used in operating systems and system programs and needs to operate hardware.

Many large-scale applications are written in C language. C language is provided to users in the form of functions, which can be easily called, and there are various loops and conditional statements to control the process of the program, thus making the program completely structured.