First we open our computer software codeblocks and find codeblocks from thousands of compilers (I am a compiler collector)
Enter codeblocks 
Click->File->project 
After entering the project, the following interface will appear, click Console application
Then select the language of the file you want to create here and click next
Then name your project, and then save it to the disk location you want to save it. After completion, click next ->Click finish 
Open Sources and you will find that you have successfully created a c++ source file. 
Continue to click File->new->file
Here we first create the corresponding header file
Click... to select the location where your header file is stored (remember it must be together with the project you created earlier) and then click Save
After saving, return to this interface, then click Finish
At this point we can see that Headers and Sources are under the same project (test) (if not, it will fail)
Then you need to create multiple source files and header files in the same way as creating this header file (just note that the file is saved in the project you created before)