C Language: Basic concepts of functions

Function: Complete a specific function code block

Function: Manage the Code

Advantages of the function: improve the readability of the Code

Improve Code reusability

Improve Code maintainability

Function: Function name cannot be defined repeatedly

To give a meaningful name to the function

Function feature: Only the call will execute

Format of function definition

Formal parameter list

return type function name (parameter type parameter name, parameter type parameter name,...)

{

Statement

....

return xxx;

}

How to define a function:

1, according to function functions to give a meaningful name to the function

2. Determine the value of some benefits that need not be descendants

3. Determine what type of data needs to be returned to the function caller

4. Complete function function

void when a function has no return value, declare the return value type of the function as void

When the return value type of the function is void, the return statement can be omitted

When do I need formal parameters: when we have a function, we can't be sure of the data, then we need to tell us.

C Language: Basic concepts of functions