So imagine for a moment that you lose access to your hard drive. All your personal information could be exposed, even if you took the precaution of deleting it. Sounds a little scary, doesn’t it? However, they have just released a program whose main function is to overwrite the blank space you have on a hard drive. In this way, the information really remains blank, making it impossible to recover it later. In fact, the name of the program is Overwrite. A very interesting tool. So here we show you how to install Overwrite for the empty space of the disks in Windows 10.

Compiling Overwrite with Visual Studio Code

Overwrite is a program written in C language, which is contained in a single file. It can be compiled on different platforms, but here we are going to compile for Windows 10. With that in mind, we are going to use Visual Studio Code. To know how to install it please check our post. In the same way, we’ll need a C/C++ Compiler, for this example I’m going to use MinGW. The installation process is simple, just go to this address and download the installer.

Then double click on the installer. When the wizard starts, select all the options for a basic installation. Next, wait for the wizard to download all the necessary files and proceed to install them. This will take a few minutes, depending on your internet connection.

Add MinGW to the environment variables.

Next, we’ll add the compiler to the Windows environment variables. This is very important because it will allow you to compile from any CMD without going to the address of the program. Also, the Run Code extension of the editor uses the command prompt of Windows to run the compiler. To find out how to do this, I invite you to check out our post about Wget in Windows 10. Here I simply show you the already added variable:

to check that everything has been installed correctly, please press the “Win+R” combination, and run CMD to open a Command Pro.

In the command prompt please type the following command:

gcc

If running the command throws the error that there are no input files, then we are ready to move on.

Install the extensions in Visual Studio Code.

Now we need to add the necessary extensions to compile in C in Visual Studio Code. With this in mind, open the program. And in the Marketplace write C++ and Code Runner, and proceed to download and install them.

All right, we’re ready to compile the program. The first thing we need to do is to download the package from here

Once downloaded, please remember the location of the download and open Visual Studio Code. Once there, in the left column in Explore, locate the folder where you downloaded the program and click on overwrite.c. Then on the menu on the right press Run.

Testing Overwrite

Finally, we have compiled Overwrite, as you can see in the previous screen, there is already an executable file for windows. However, this program does not have a graphical interface but must be executed in a CMD. In addition, it is necessary to open a Command Prompt at the location of the program. To avoid this complication, we will add the environment variable.

Uses of Overwrite

overwrite [-h -v -test -one -rand -block:] (-files: &| -data:) -path: 
-h             Print help and usage message. 
-v             Print program version. 
-test          For test, don't delete written files. 
-one           Overwrite with 1, default with 0. 
-rand          Overwrite with random data, default with 0. 
-block         Block size, default 4096 bytes as NTFS and EXT4. 
-files         Number of files to write, block size each. 
-data          Quantity of data to write, ex: 1mb, 1gb, all. 
-path          Path to directory where to write data. 

Let’s use a practical example. Write 10 files and 10Mb data, on Windows C drive.

 overwrite -files:10 -data:10mb -path:c:\ 

Obviously, there are several commands we can use to run the tool. Very well, we have learned how to install Overwrite for the empty space of the disks in Windows 10. And also, we have seen how to compile C in Visual Studio Code. I hope you enjoyed this tutorial as much as I did. See you next time.

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Lightweight and very efficient

This programming language was created by Alex Medvedniko, a Dutch developer who says he has a strong commitment to simplicity and performance. You can see that in V. Because V and all its libraries only occupy 400kb. Crazy! But yes, the language has ambitions and only with this size will we be able to work.

On the other hand, the language is in an early stage of development, but it shows us characteristics to which we must pay a lot of attention. Some of them are:

• Secure. Because it does not allow global variables, null values, strange behaviors of functions, nor undefined values.
• Fast. I think this is V’s main point. It can compile 1.5 Million lines of code per processor core. It’s wonderful.
• Code translation from C. If you have a project from C, you can convert the source code to V, without any problem.
• Compiler with 0 dependencies. In addition, it only weighs 400 kb.
• Hot Code Reload. It is not necessary to compile frequently to get the desired changes. Of course, in some cases yes, where there are many lines of codes.

Finally, the programming language V will have version 1.0 in December if all goes well. However, you can already do some work using it.

Getting the V programming Language

As expected, V is open-source. For now, only Linux and MacOS versions are available, but Windows will soon be added. Just download it and put it in /usr/local/bin/ to start working. You can also download the source code and build it from there.

In addition, the project tells us that it is easier to use than GO, but that it has similar documentation. On the other hand, its performance is similar to C and they plan to support graphics libraries like Vulkan or DirectX.

For now, we just need to keep an eye on this project. If you are a developer I recommend you do the same because the features are interesting.

Share this post with other friends of yours whether they are developers or not.

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Some time ago I was talking to you about how to compile C++ on Linux. This served as a gateway for many programming enthusiasts. However, I think you should start with the first thing. What is C++?

In short, C++ is a compiled programming language that supports object-oriented programming. With this language many important applications have been created such as Microsoft Office, LibreOffice and more than half of MariaDB.

Codeblocks to write code better

To write code optimally, it is best to do it with an IDE. Many times choosing the right IDE can reduce coding times and improve the way software is built.

With this in mind is that Codeblocks arises, to be highly configurable and adaptable to each of the developers. It is also supports the Fortran language which although less popular than C++ is still used for educational and scientific purposes. In addition, it has Code completion, class browser and smart indent.

Codeblocks is released under the GPL3 license which guarantees that it is open source and can be installed on various operating systems such as Windows, Mac OS and of course for Linux.

Codeblocks features

There are many features that make Codeblocks a fantastic IDE. These are some of them:

• Open Source. That means it’s free, no tricks, nothing like that. Ideal if you’re learning to program and don’t want to pay for IDE.
• Cross-platform. It can be installed on Windows, Mac Os and Linux. However, the fact that it can be installed on Linux is enough, isn’t it?
• Does not require external libraries because it is written in C++.
• Thanks to the plugins you can extend their functionalities.

It is compatible with many compilers such as GCC, clang or Digital Mars.

Install Codeblocks on Linux

The installation of Codeblocks on Linux is very simple. You should go to this link and select the binary you want. If you use Debian, Ubuntu or one of their derivatives, then you must choose the .deb format. If you use Fedora, openSuse or CentOS 7, then .rpm.

In this case, I will install Codeblocks on a Debian 9 system, so I will choose to download the .deb packages.

Once the file has been downloaded and decompressed. Proceed to install them by terminal. The content of the downloaded file I have put in a folder called codeblocks.

Then, open a terminal, locate it in the directory and run:

:~$ cd codeblocks
:~$ sudo dpkg -i *.deb

In case you have any unfulfilled package or dependency. Run:

:~$ sudo apt --fix-broken install

Finally, open it from the main menu.

And that’s it.

Conclusion

The process of making a program is not simple, it requires a lot of time and tools to make available to the developer a series of features to help in this process. Fortunately there is Codeblocks, a free, multi-platform tool full of ready to use features.

Tell us, are you a C++ developer? Or Fortran? How was your experience with this IDE?

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C++ are programming languages well known for the vast amount of programs created with them, in addition to their long history in the world of computers, which is why it serves as an entry language for all those who want to learn programming from the beginning.

GNU/LINUX and C++ is an ideal combination if you want to learn programming at a low cost

1.- Installing compiler and others libraries

If we want to write and compile a code, we must have installed the compiler of that language, additionally we can also install other libraries associated with the language to extend its functionality. Open a terminal and log in as root user and then:

For Debian and Ubuntu:

:~# apt install build-essential

On Opensuse LEAP and Tumbleweed

:~# zypper install -t pattern devel_C_C++

For CentOS 7:

:~#yum groupinstall 'Development Tools'

The above commands not only install the C++ compiler which is g++ but also other tools for building packages.

2.- Creating the .cpp files

We have large editors to create our text files, from integrated in the terminal (nano, vi…), complete IDE (netbeans, eclipse) or text editors (atom, komodo, visual code), depending on the taste of each one, but as we are going to compile from the terminal, we will use nano.

:~$ nano helloworld.cpp

And in it we started to write our code for example:

#include<iostream>
using namespace std;
     int main(){
        cout<<"Hello World";
        return 0;
      }

Then we save and close and go to the console to compile the file.

3.- Compiling the code

Now we save and exit nano with ctr+x and invoke g+++, that is, the C++ compiler. Write:

:~$ g++ -o executable helloworld.cpp

We explain briefly, g+++ is the compiler; -or is a flag option that indicates that the next element is the name of the executable; executable is the name of the binary that is generated after compiling the file, you can put the name you want; helloworld.cpp is the name of the.cpp file that is going to be compiled, you can also indicate an absolute path of a file.

If the code is spelled correctly and without errors, when executing that command we should not have any output messages.

Product of the previous command an executable is generated.

4.- Run a c++ program from an executable in the terminal

To run an executable file created by g+++ on a terminal, type the following:

:~$ ./file_name

In some cases we can find compatibility errors with g+++ when using many specific functions within our code, for this we will use:

:~$ g++ -std=c++11 -o executable helloworld.cpp

and the problem should be solved.

Compile with g+++ a program that requires libraries

The above example we compiled a simple code, but what if we want to compile one that requires other libraries?

First we will create 3 files, the first one will be the main one, then we will make the library and the code of that library. To do this we will make a main code that simply multiplies two numbers, but using an external library.

:~$ nano main.cpp

In it we write:

#include<iostream>
#include"library1.h"
using namespace std;
int main(){
int result = multiplication(1,1);
cout << "result is: " << result << "\n";
return 0;

}

Now we’ll do the.h file from the library

:~$ nano library1.h

And inside the editor we place the following content

int multiplication(int,int);

we finally created the last file:

:~$ nano library1.cpp

And here’s what we put in:

#include"biblioteca1.h"

int multiplication(int a, int b){
return a+b;

}

Now we proceed with the compilation:

:~$ g++ -Wall main.cpp libreary1.cpp -o executable2

We proceed to explain: unlike the previous example, we add the -Wall option so that it shows us all the warnings that occur during the compilation; then we compile all the.cpp that are really the sources of the program; and with the instruction -o we point to the output file.

Now we run:

:~$ ./executable2

And that’s it. As we can see it is easy to compile files with g+++ and GNU/LINUX, we would need to learn all the options that the compiler gives us from the terminal, although for that we would need another article.

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