How many types of C language functions are there, please list them in detail, thank you prawns

In C, the types of functions can be divided into the following types:

1.Functions without return values without parameters: These functions do not need to pass arguments or return values, and they usually define some actions or statements that perform certain actions. The format of the function definition is: void Function name ().

2.Parameterless functions with return values: These functions do not need to pass parameters, but they need to return a value, which is usually used to calculate a value and return the result. The format of the function definition is: Data Type Function name ().

3.Functions with return values and parameters: This type of function needs to pass one or more parameters and return a value, which is usually used to complete some operation that calculates the result based on the input parameters. The format of the function definition is: Data Type Function Name (Parameter List).

4.Functions with no return value: This type of function needs to pass one or more parameters, but does not need a return value, and is usually used to complete some operations to modify the state of the program, such as changing global variables.

The format of the function definition is: void function name (parameter list).

In the C language, the choice of function type depends on the specific needs and usage scenarios of the function, and different types of functions can be selected for development according to your needs. It should be noted that when developing functions, it is necessary to comprehensively consider the function, input parameters, and return values of functions to avoid program errors or non-compliance with design requirements.

C functions are a basic program segment with strict syntax rules:

The syntax of the pure function definition in C is as follows: The return type, function name, and parameter list of the function definition must be consistent with the function declaration.

Some books inexplicably categorize functions into library functions and custom functions. There is really no difference between the two functions.

For example, how do you classify the functions in the library that you wrote?

Therefore, from the perspective of the actual C language, there are only two types of functions to do jujubes:

1. Ordinary functions.

2. Inline functions.

There are two types of functions in the C language: library functions and user-defined functions.

The two are actually no different, so don't force it to be classified, all functions are the same.

Functions in C can be divided into the following categories:

Built-in functions: These are functions provided by the C standard library, such as math functions, string functions, etc.

Custom functions: These are functions defined by the programmer themselves and can be used to implement a specific function.

Library Functions: These are functions that are provided by other library files, such as Windows API functions, database functions, and so on.

Recursive functions: These functions call themselves in their own function body and can be used to implement certain algorithms.

Inline functions: These functions can be embedded directly by the compiler into the call, reducing the overhead of the number of calls.

What is the classification for? This kind of classification doesn't seem to be mentioned by many people, and it's useless.

The functions that make up a C program can be divided into two basic types:

One is a function provided by the C language system, which can be called directly by the user in the program to complete certain functions, and this kind of function is also known as the "library function" or "standard function" of the C language.

The other is a function defined by the user in the program, which is determined by the user according to the application.

The program modules that are defined to complete specific functions are called "user-defined functions".

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

The library where the character library function is located is; The library where the math function is located is; The library where the directory function is located is; The library where the process function resides is.

The library where the diagnostic function is located is; The library where the interface subroutine is located is; The library where the operation function is located is; The time and date function library is.

In C, functions can be called in the following ways:

1.Function Expression:

2.Function statement:

3.function arguments;

Nested calls to functions.

Functions in C have their own specific types.

The type of the function is determined byThe return value, parameter type, and number of parameters are determined together

intadd(inti,intj) isint(int ,int)

C language passedtypedefRename the function type.

typedeftype name(parameter list)

Examples:typedefint f(int ,int);

typedefvoid p(int);

Declare two function types f , p

These two types allow you to declare function pointers.

f *f;p *p;

The type of the function refers to the return value type of the function, such as int double....The default is the int type, if the function does not return a value, it should be defined as void type; The function definition includes the function header and the function body, which in turn includes the function type, function name, form parameters, and storage mode, etc., and the function body is the specific function of the function implementation. The function prototype is the semicolon after the first part of the function, that is, the declaration of the function.

In many programming languages, you can encapsulate a section that is often used, and you can call it directly when you need to use it, which is a function in the program. As in the C language:

int max(int x,int y)

It is a function that compares the size of two numbers, and the function has parameters and return values. Functions in C++ programming can be divided into two categories: those with arguments and those without arguments. The declarations and definitions of these two parameters are also different.

Declarations of functions with (a) arguments:

Type Name Identifier + Function Name + (Type Identifier + Arguments) Declaration of a function without parameters:

void+function name ( ).

Inside the curly braces are the body of the function.

Functions with arguments have a return value, and functions without arguments have no return value.

Calling a function in C++: A function must be declared before it can be called. The call format is:

When the function name (arguments) is called, the number of arguments in parentheses after the function name must be the same as the number of arguments in the parentheses of the function when the function is declared. Functions with return values can be computed or assigned as rvalues.

Some functions in the C language:

main (main function).

max (a function to find the maximum number).

scanf (input function).

printf (output function).