C11 added two keywords that allow to better express your intentions with what you want to do with virtual functions: override and final.They allow to express your intentions both to fellow humans reading your code as well as to the compiler. C Function Overriding In this article, you will learn about function overriding. Also, you will learn how can assess the overridden function of the base class in C programming. Inheritance allows software developers to derive a new class from the existing class. The derived class inherits features of the base class (existing class). So we are going to delete this file, using the above program. Let us compile and run the above program to produce the following message and the file will be deleted permanently. File deleted successfully.
Currently im making a little program that can overwrite a .txt file i have included in my .cpp file (ifstream infil('biljett.txt');
I made an example. This is for a cenima. The purpose of this program is for 'people' to see what movie that is avaible for them to watch (by selecting in the program).
If someone uses this program for example and selects Movie1, and enter how many tickets they want to buy. Once he/she close the program, it will overwrite the current .txt file biljett.txt.
And in the end, once all the tickets are sold out, the program is going to 'reset' the biljett.txt as it was from the beginning. My problem is, i can't find anywhere about this overwrite thing, i know it's possible cause i have seen a similar program around the webb.
Can anyone help me out?
Here is the code.
NOTE: Im from Sweden, the sentences translated from the beginning
Movie1: How many tickets do you want to reserve?
What movie do you wish to see?, hit 1 for Movie1, 2 for Movie2, 3 Movie3,4 Movie4
############################################################################
//Start
#include <iostream>
#include <conio.h>
#include <windows.h>
#include<fstream>
using namespace std;
void menu()
{
int a,b, c, d ;
char s;
s = _getch();
if (s'1')
{
cout<<'Movie1: skriv in antal biljetter du vill köpa: ';
cin>>a;
}
else if (s'2')
{
cout<<'Movie2: skriv in antal biljetter: ';
cin>>b;
}
else if (s'3')
{
cout<<'Movie3: skriv in antal biljetter: ';
cin>>c;
}
else if (s'4')
{
cout<<'Movie4: skriv in antal biljetter: ';
cin>>d;
}
}
main()
{
int n=0, menu();
char tecken;
ifstream infil('biljett.txt');
while (infil.get(tecken))
{
cout.put(tecken);
if (tecken 'n')
n++;
}
cout<<endl;
cout<<endl;
cout<<'Vilken film vill du se?, klicka 1 för Movie1, 2 för Movie2, 3 Movie3,4 Movie4.';
cout<<endl;
cout<<endl;
menu();
cout<<endl;
infil.close();
system('PAUSE');
}
//Stop
#############################################################################
This is what the textfile looks like:
Salongnummer: Salonnumber
Filmnamn: Name of the movie
Antalplatser: Total amount of seats
Antal sålda biljetter: Total amount of sold tickets (to seats)
Salongsnummer Filmnamn Antalplatser Antal sålda biljetter
1 Movie1 300 255
2 Movie2 200 15
3 Movie3 200 200
4 Movie4 300 0
If you need me to provide more information to help me out, just tell me.
Regards Johan
In this tutorial 5 tools to carry out a full removal of data, wipe, srm, dd, shred and scrub are shown. The programs can be executed from live cd distributions to wipe the hard drive completely.
WIPE
The wipe command allows us to fully erase data from our disk, it rewrites the sector and flushes the cache making it impossible or very difficult to retrieve the data.
To install wipe on Debian/Ubuntu type:
C++ Overwrite Operator
The wipe command is useful to remove files, directories partitions or disk.
To remove a single file using wipe type:
To report on progress type:
To wipe a directory type:
To wipe a partition or disk speeding up the process add the parameter -q, type:
Note: replace sdx for the proper device.
The last example will wipe everything from the disk or partition without possibility to restore it, type man wipe in the terminal to see all options available.
SRM
srm overwrites the data before deleting it, it is a similar option to wipe. To install srm on Debian or Ubuntu type:
Type man srm to see the available options
As you can see similarly to rm you can use
To remove a file:
To remove a directory:
For additional information on srm type:
DD
DD can be used to overwrite a disk. If you formatted a disk you can run the following command to fill the disk with random data, making it impossible to restore. Replace the X for the proper disk. Dd overwrites the disk with zero and allows us to format the device in different formats. It comes by default on Debian and Ubuntu based distributions.
How To Remove Overwrite In Dev C Windows 7
To fill a disk with random data using dd run:
For additional information on shred on the terminal type:
SHRED
Shred is another alternative to safely remove data, it comes by default on Debian/Ubuntu if it doesn’t type:
Shred is simple to use too, to overwrite a file just type:
After an ls we see the directory is still there,it was overwritten, to remove it after writing add the -u parameter:
How To Remove Overwrite In Dev C Windows 10
As you can see after the -u there is not linuxhintshred directory.
How To Remove Overwrite In Dev C In Excel
For additional information on shred type:
Scrub
Scrub is another tool to overwrite data in hard disks, Scrub writes patterns on files or devices making the data retrieval more difficult. Scrub works in 3 modes detailed in the main page, the default mode is the most effective one.
to install Scrub run:
Type
As the man says we can wipe a disk by running:
To create a directory and fill it with files until the system is full run:
For additional information on Scrub option and parameters, in the console type:
I hope you found this tutorial useful to get your data fully removed, should you have any inquiry contact us opening a ticket support at LinuxHint Support. Keep following LinuxHint for more tips and updates on Linux.