How many types of functions are there in C language?

The function type describes the interface of the function. This means that the type specifies both the type of the function's return value and the types of all parameters passed to the function when the function is called.

Generally include character library functions, mathematical functions, directory functions, process functions, diagnostic functions, operation functions, etc.

The function library where the character library functions are located is ctype.h; the function library where the math functions are located is math.h, stdio.h, string.h, float.h; the function library where the directory functions are located is dir. h, dos.h; the function library where the process function is located is stdlib.h, process.h.

The function library where the diagnostic function is located is assert.h, math.h; the function library where the interface subroutine is located is: dos.h, bios.h; the function library where the operation function is located is string.h, mem.h; The time and date function libraries are time.h and dos.h.

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