current position:Home>How to define and initialize structures in. H
How to define and initialize structures in. H
2022-02-02 23:04:29 【CSDN Q & A】
To facilitate development , I defined a Global.h The file of , And in this file , Defines a structure Stu, In order to use , I defined another EmptyStu, And copy it , As the code shows :
#ifndef _GLOBAL_H_#define _GLOBAL_H_struct Stu{ char * name ; char * info ; long age ;}typedef struct Stu Stu ;const Stu EmptyStu = {
NULL,NULL,0}#endif
It's such a program , The result is wrong , Yes 2 A mistake :
Main.c:(.bss+0x0):multiple definition of `EmptyStu'Global.c:(.bss+0x0): first defined here LoginUI.c:(.bss+0x0): multiple definition of `EmptyStu'Global.c:(.bss+0x0): first defined here
Be careful , I'm here Main.c and LoginUI.c It's all imported "Global.h".
put questions to :
1、 I can't figure out why the definition is repeated ;
2、 stay .h In file , How to define the structure , And give a fixed value to one of the variables , And it's best to keep its global variable characteristics , as well as const Make sure it doesn't change ?
Refer to the answer 1:
Add a constructor to the structure to initialize the default value
Refer to the answer 2:
Refer to the answer 3:
thank you , I've solved it myself
Refer to the answer 4:
copyright notice
author[CSDN Q & A],Please bring the original link to reprint, thank you.
https://en.primo.wiki/2022/02/202202022304269499.html
The sidebar is recommended
- Dlib is already in setting, but there will still be errors when running
- Vs2015 migration project, failed to connect can
- www.bing. Com took too long to respond
- Why do computers use complement codes
- Why do floating point numbers lose accuracy? How to understand
- The problem of Vue routing history mode jumping to a new window
- PR how to remove the original video subtitles
- How do I get a set of filtered drop-down items in an excel table?
- How to set to allow the WWW service to pass through the server (port 80)
- What are the recording chips with built-in flash? It can record about 40 seconds. What are the characteristics of the chip?
guess what you like
-
The company has added a batch of computers. Now it needs to add a network segment to divide the new computers into this network segment
-
Jenkins deployment project execution pipeline script prompt: Python module not found
-
Do you know how to solve & lt/ details> Too many child elements in the page will cause the page to jam when sliding
-
Which database does the following text image come from? Does anyone know the original image and GT image?
-
How to install PIP? I have found many ways to install it, as shown in the figure
-
It's a little difficult for you to find mistakes. All kinds of mistakes
-
MySQL sub nested data update
-
How do I get the words on the console to the window?
-
How to extract specified data from text in C language
-
Failed to load file or assembly
Random recommended
- How does git handle this situation
- How does Python prevent multiple logs under the same file from writing to one file at the same time
- 174 allocation treasure binary violence solution error
- How does Calc (x - y) in CSS make y the height of a class
- How does CSDN mask messages
- About javascript: iframe web page B is embedded. There is a form in web page B, and the parent Web page a does not refresh
- Wechat applet authorization login problem
- C language, enter 10 integers, find the average and fill in the blank
- The linked list code in cFree can run, but the memory limit is exceeded when submitting
- Oracle database startup failed. The data file header is damaged
- In EF core, how to create a sequence and set nextvalue as the default value when defining the ID of a table?
- timing npm:load:cleanupLog Completed in 2ms
- Esp8266 failed to connect to the serial port, indicating that the serial port is occupied or does not exist
- It's strange why the output is - 1
- Here's why getchar can be executed. After it becomes scanf, even if the correct value is entered, it still prompts for input error
- Is there a question about monotonous station
- Using C + + to complete different N / I applets
- What's the matter with API
- Canvas cannot load picture Tkinter
- A simple code to solve it
- If the HTML page cannot be displayed normally, the code of {% block head%} {% endblock%} will be displayed directly. I don't know what the problem is
- What's wrong with this code that skips uppercase letters and only outputs lowercase letters?
- First clear the content in the text, and then add content in the?
- Problems about Jason object in Java front end
- Unreal 4 code version failed to compile and did not move anything. It was downloaded and compiled directly in GitHub. Only one project failed. Please solve it.
- HTML enters jump for the first time and does not jump for the second time.
- How is the progress bar of Python multi process displayed on the UI?
- The complete link and operation method of tiktok draining to the website need to be effective
- Simulink simulates the vector control (FOC) of permanent magnet synchronous motor and starts the oscillation problem
- Dynamic linked list failed to use bubble sorting
- Remote connection redis problem
- Table a and table B, after changing sides, use explain. The result is a little unexpected. Why
- What's the matter with entering an even number in idea to get "= number"?
- How can C language use a function to find characters and replace them
- Several problems in introductory learning!
- Input two strings STR1 and STR2, connect the string STR1 to STR2, and output STR1 and its length (prompt: string connection function: strcat (STR1, STR2) string length calculation function: strlen (STR))
- Using pointer variable: input a one-dimensional array from the keyboard and return one-dimensional array containing only odd numbers and one-dimensional array containing only even numbers respectively. The data in the array is sorted from small to large.
- Maze game, maze initialization, specify the entrance or exit position, and print the maze.
- The notebook may normally accept the sent information, but it can't load the web page. The network diagnosis and treatment shows the results in the figure below. How should I solve it?
- Car interaction code in Android studio