This approach is doomed to failure and usually requires rewriting from scratch.
So, to solve this scenario, we can try to divide the problem into several sub-problems and then try to solve it one by one. p>
This not only makes our task easier, but also allows us to achieve Now the big question is how to "break" not theoretically, but SOFTWARE . We will see several different types of such units in popular languages ‚Äã‚Äãsuch as C / C++, Python & amp; Java. For illustrative purposes, Let’s assume we have all the basic linked list inserts in one program. Since there are many methods (functions), we cannot clutter the program by writing all the method definitions above the required main function. But even if we did, there might be a problem of ordering methods, when one method should be before another, and so on. So, to solve this problem, we can declare all prototypes at the beginning of the program, and then the main method and below that we can define them in any particular order: Program :
C / C++
Now the big question is how to "break" not theoretically, but SOFTWARE .
We will see several different types of such units in popular languages ‚Äã‚Äãsuch as C / C++, Python & amp; Java.
For illustrative purposes,
Let’s assume we have all the basic linked list inserts in one program. Since there are many methods (functions), we cannot clutter the program by writing all the method definitions above the required main function. But even if we did, there might be a problem of ordering methods, when one method should be before another, and so on.
So, to solve this problem, we can declare all prototypes at the beginning of the program, and then the main method and below that we can define them in any particular order:
Compiling the code: we can compile the above program:
gcc linkedlist.c -o linkedlist
And it works!
The main problems in the above code:
We can already see the main problems with the program, it is not so easy to work with the code either individually or in a group .
If someone wants to work with the above program, then some of the many problems that person is facing:
- One has to go through the Full Source File. to improve or improve some functionality.
- Cannot be easily reused the program as a basis for other projects.
- The code is very cluttered and is not attractive at all, which makes it very difficult to navigate through the code.
In the case of a group project or large programs, the above approach is guaranteed to increase overall costs, energy, and failure rates. p>
We see that these lines begin in every C / C++ program that starts with "#include".
This means to include all functions declared in the "library" header (.h files) and defined possibly in library.c / cpp files. p>
These lines are preprocessed at compile time.
We can manually try to create such a library for our own purposes.
Important things to remember:
- The ".h" files contain only prototype declarations (such as functions, structures) and global variables.
- The ".c / .cpp" files contain the actual implementation ( declaration definitions in header files)
- When compiling all source files, make sure that multiple definitions of the same function, variable, etc. do not exist for the same project. (VERY IMPORTANT)
- Use static functions, to restrict yourself to the file in which they are declared.
- Use the extern keyword to use variables referenced by and external files.
- When using C++, be careful with namespaces, always use namespace_name :: function (), to avoid collisions. ol >
By splitting the program into smaller codes:
After examining the above program, we can see how this large program can be split into suitable small parts and then easily processed.
The above program has essentially 2 main functions:
1) Create, insert and save data in nodes.
2) Displaying nodes
This way I can split the program accordingly so that:
1) The main file is & gt; Program driver, Nice Wrapper from Insertion Modules and where we use additional files.
2) Paste - & gt; The real implementation lies here.
With the important points mentioned, the program is divided into:
linkedlist.c - & gt; Contains Driver Program
insert.c - & gt; Contains Code for insertion
linkedlist.h - & gt; Contains the necessary Node declarations
insert.h - & gt; Contains the necessary Node Insertion Declarations
In each header file we start with:
#ifndef FILENAME_H #define FILENAME_H Declarations ... #endif
The reason we write our declarations between #ifndef, #define and #endif, is to prevent multiple declarations of identifiers such as data types, variables, etc., when one and the same header file is called in a new file belonging to the same project.
For this sample program:
insert.h - & gt; Contains the declaration of the insert node as well as the declaration of the node itself.
It is very important to remember that the compiler can see declarations in the header file, but if you try to write code that includes the declaration elsewhere, this will result in an error, as the compiler compiles each .c file individually before moving on to the link step. ,
connectedlist.h - & gt; A helper file that contains Node and its Display declarations that must be included for files that use them.
insert.c - & gt; Include a Node declaration via #include "connectedlist.h", which contains the declaration as well as all other method definitions declared in insert.h.
connectedlist.c - & gt; Simple Wrapper, containing an infinite loop prompting the user to insert integer data at the required positions, and also containing a method that displays the list.
And the last thing to keep in mind is that meaningless inclusion files into each other can lead to multiple overrides (s) and will result in an error.
Taking the above into account, you should carefully divide into suitable routines.
Splitting a large file into separate modules in C / C ++, Java and Python _files: Questions
How do I list all files of a directory?
How can I list all files of a directory in Python and add them to a
If you want just files, you could either filter this down using
or you could use
I prefer using the
It does pattern matching intuitively
It will return a list with the queried files:
With listdir in os module you get the files and the folders in the current dir
Looking in a directory
with glob you can specify a type of file to list like this