2. First knowledge of C language (2)

First time to know C Language （2）

Catalog

VS Installation and creation project of

install

Create project

newc++.cpp File settings

---

VS Installation and creation project of

• install

Microsoft visual studio It is very easy to use programming software , among community The version is free , It is very suitable for beginners .

at present VS Updated to 2022 edition , The official website is as follows ：

Visual Studio: IDE and Code Editor for Software Developers and TeamsVisual Studio dev tools & services make app development easy for any developer, on any platform & language. Develop with our code editor or IDE anywhere for free.https://visualstudio.microsoft.com/ The installation process is not complicated , It is recommended to choose the default installation path .

• Create project

function VS2022, Click on the right to create a new project .

Select empty item , Click next .

  Enter the project name , Choose the path to save the project , The path here is recommended to be changed manually , Set it in the folder you can find , Click next .

 

  An empty project is generated , Right click the source file —— add to —— New item

choice C++ file , Because we're using C Language , Note that the suffix of the name should be changed to .c, Click Add .

  An empty source file is generated , The same is true if you create a new header file .

newc++.cpp File settings

 VS After installed , If we start writing programs at this time , May come across scanf The reason for the error of wait function

  for example ：

#include<stdio.h>

int main()
{
	int a = 0;
	scanf("%d", &a);

	return 0;
}

Running the above code will report an error ：

error C4996: 'scanf': This function or variable may be unsafe. Consider usingscanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

Here the compiler thinks scanf It's not safe , It is recommended that we use scanf_s Instead of , Or define in the first line of code _CRT_SECURE_NO_WARNINGS.

The first method is only in VS When used in , yes VS Self defined . Here we use the second method , Add #define _CRT_SECURE_NO_WARNINGS that will do .

But it is very troublesome to add the source file manually every time you open it , How can it be done once and for all ？

The method is as follows ：

Right click VS Icon , Click properties —— Where to open the file .

Search in the folder newc++, Find the suffix .cpp The file of . 

Right click , Open mode —— Notepad , take #define _CRT_SECURE_NO_WARNINGS Paste it into the text and save it , Choose to overwrite the original file when saving .

If an error is reported, it shows that you have no permission , Don't be nervous .（ Most students' computers will have such problems ）

Method 1 ： Create a new notepad on the desktop , Right click —— Run as an administrator , Open and paste our code into the text , Rename the text to newc++file.cpp And then to VS Overwrite the original file under the installation directory .（ recommend win10 Using this method ）

Method 2 ： look for newc++file.cpp The folder where the file is located , Make a copy of the document , Paste it on the desktop .（ recommend win11 Using this method ）

Right click the file copied on the desktop , Choose how to open —— Text （ use VS Open it ）, Paste the above code , preservation .

  Then drag and drop the files on the desktop to the original folder , The system will prompt whether to overwrite , Choice is .

Prompt that administrator permission is required ,win11 The administrator permission of home edition is turned on by default , Click ok .

Then create a new source file every time , This line of code will be automatically added in the first line , You don't have to add it manually , Very convenient .

It's suggested that you should be in VS After installation , take newc++.cpp The file is set , Especially for beginners , It can avoid many unnecessary bug appear .