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This article mainly introduces the relevant knowledge of "c language function example analysis". Xiaobian shows you the operation process through actual cases. The operation method is simple, fast and practical. I hope this article "c language function example analysis" can help you solve the problem.

Basic concepts of functions

The "function" in programming is translated from the English "function". In its sense, the function has the meaning of function, that is to say, the purpose of defining a function in the program is to make it complete a certain function, and this function will be used many times in the program. Usually, when designing a complex problem, decomposition method is used to decompose the problem into several relatively independent sub-problems, each of which corresponds to a functional module of the program.

From the perspective of user use, functions are divided into "library functions" and "custom functions." The functions provided by the system for users to call directly are called library functions; the functions defined and called by users in the program are called custom functions.

Library functions and custom functions

library function

In C, standard library functions provided, such as

printf, scanf, fabs, strlwr, etc.

Features are easy to use, just need to use #include at the beginning of the program to refer to the corresponding.h file, for example

#include,#include, etc.

In addition to using library functions, you can also define your own functions

custom function

General form of function definition:

Type specifier function name (formal parameter declaration list)

{

Description and definition section;

sentence part;

}

When there are more than one parameter, each parameter must be described independently and separated by commas. For example:

int max(int a, int b)

{

... ...

}

If the function does not require parameters, the parameter list can be empty, but the parentheses after the function name cannot be omitted. For example:

void info()

{

... ...

}

void indicates that the function has no return value, and there is no need to return the processing result of the function to the function caller as the function return value.

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