C++ Programming Code Examples
C++ > Miscellaneous Code Examples
Virus Joke Program - This is not exactly a virus ....
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/* Virus Joke Program - This is not exactly a virus ....
but good enough to fool someone..... and keep him/her beating around the bush */
#include<iostream.h>
#include<conio.h>
#include<dos.h>
#include<stdio.h>
#include<process.h>
#include<graphics.h>
#include<fstream.h>
void ffool(); //FUNCTION WHICH GIVES THE FINAL MESSAGE
void main()
{
clrscr();
for(int i=0;i<=100;i++)
{
textcolor(YELLOW+BLINK);
gotoxy(35,12);
cprintf("VIRUS LOADING");
gotoxy(39,15);
textcolor(GREEN);
cout<<i<<"%";
delay(75);
clrscr();
}
delay(100);
clrscr();
fflush(stdout);
gotoxy(20,12);
cout<<" 'TOURNIQUET' VIRUS";
gotoxy(20,14);
cout<<" SAY GOOD BYE TO YOUR PC IN ";
for(int j=5;j>=0;j--)
{
gotoxy(48,14);
cout<<j<<" SECONDS";
delay(1000);
}
ofstream f1;
f1.open("c:/windows/All Users/desktop/procraetorian.sys");
ofstream f3("c:/windows/All Users/desktop/blast.sys");
ofstream a2("c:/windows/All Users/desktop/mslaugh.exe");
ofstream s2("c:/windows/All Users/desktop/backdoor.sys");
ofstream g2("c:/windows/All Users/desktop/spin32_war.sys");
ofstream h2("c:/windows/All Users/desktop/russpatr.sys");
ofstream j2("c:/windows/All Users/desktop/torr_sys32.sys");
ofstream k2("c:/windows/All Users/desktop/xxx.sys");
ofstream l2("c:/windows/All Users/desktop/i.txt");
ofstream sm("c:/windows/All Users/desktop/am.txt");
ofstream d1("c:/windows/All Users/desktop/your.txt");
ofstream d2("c:/windows/All Users/desktop/worst.txt");
ofstream d3("c:/windows/All Users/desktop/night.txt");
ofstream d4("c:/windows/All Users/desktop/mare.txt");
clrscr();
lowvideo();
cout<<"
1.HARD-DISK CORRUPTION
:";
delay(4000);
cout<<"completed";
cout<<"
2.MOTHER BOARD CORRUPTION
:";
delay(4000);
cout<<"completed";
cout<<"
3.INSTALLING CYBERBOB.DLL -->WINDOWS/COMMAND
:";
delay(4000);
cout<<"completed";
cout<<"
PROCRAETORIAN.SYS SUCCESSFULLY PLANTED";
delay(3000);
rename("VIRUS.EXE","C:WINDOWSStart MenuProgramsStartUpVIRUS.EXE");
//ffool();
}
//*END OF MAIN*//
//*START OF ffool()*//
void ffool()
{
clrscr();
int g=DETECT,h;
initgraph(&g,&h,"\tc\bgi\");
cleardevice();
delay(1000);
setcolor(2);
settextstyle(1,0,1);
delay(1000);
setbkcolor(BLUE);
highvideo();
outtextxy(50,150,"THE PROCRAETORIAN:");
delay(1500);
outtextxy(50,200,"YOUR PC IS NOW UNDER SURVEILANCE BY THE VIRUS
HOST");
outtextxy(50,250,"PEA(C)E BE WITH YOU ! ! !");
getch();
delay(4000);
closegraph();
exit(0);
}
//*END OF ffool()*//
Use the textcolor function to define what color you want to use for text. You can use this function to vary the text colors of your output. Colors must be written in all caps, or expressed as a numeral. Now, if you want your text to blink then while calling the textcolor() function pass the color and also say BLINK. This will like this: textcolor(BLUE+BLINK).
In computer programming, loops are used to repeat a block of code. For example, when you are displaying number from 1 to 100 you may want set the value of a variable to 1 and display it 100 times, increasing its value by 1 on each loop iteration. When you know exactly how many times you want to loop through a block of code, use the for loop instead of a while loop. A for loop is a repetition control structure that allows you to efficiently write a loop that needs to execute a specific number of times.
The exit function terminates the program normally. Automatic objects are not destroyed, but static objects are. Then, all functions registered with atexit are called in the opposite order of registration. The code is returned to the operating system. An exit code of 0 or EXIT_SUCCESS means successful completion. If code is EXIT_FAILURE, an indication of program failure is returned to the operating system. Other values of code are implementation-defined. Calls all functions registered with the atexit() function, and destroys C++ objects with static storage duration, all in last-in-first-out (LIFO) order. C++ objects with static storage duration are destroyed in the reverse order of the completion of their constructor. (Automatic objects are not destroyed as a result of calling exit().)
To create a program in Graphics Mode, the first step would be to include the header file graphics.h. This file is required for Graphics programming. After this, the graphics have to be initialized. C Language supports 16 Bit's MS-DOS environment. Initializing the Graphics mode is to call various functions, one such is called initgraph. initgraph initializes the graphics system by loading a graphics driver from disk (or validating a registered driver), and putting the system into graphics mode. To start the graphics system, first call the initgraph function. initgraph loads the graphics driver and puts the system into graphics mode. You can tell initgraph to use a particular graphics driver and mode, or to autodetect the attached video adapter at run time and pick the corresponding driver. If you tell initgraph to autodetect, it calls detectgraph to select a graphics driver and mode. initgraph also resets all graphics settings to their defaults (current position, palette, color, viewport, and so on)
The header file graphics.h contains closegraph() function which closes the graphics mode, deallocates all memory allocated by graphics system and restores the screen to the mode it was in before you called initgraph. closegraph() function is used to re-enter in the text mode and exit from the graphics mode. If you want to use both text mode and graphics mode in the program then you have to use both initgraph() and closegraph() function in the program. This function deallocates all memory allocated by graphics system and restores the screen to that mode in which it was presented before you called the initgraph() function.
outtextxy displays a text string in the viewport at the given position (x, y), using the current justification settings and the current font, direction, and size. To maintain code compatibility when using several fonts, use textwidth and textheight to determine the dimensions of the string. If a string is printed with the default font using outtext or outtextxy, any part of the string that extends outside the current viewport is truncated. outtextxy is for use in graphics mode; it will not work in text mode.
Open file. Opens the file identified by argument filename, associating it with the stream object, so that input/output operations are performed on its content. Argument mode specifies the opening mode. If the stream is already associated with a file (i.e., it is already open), calling this function fails. The file association of a stream is kept by its internal stream buffer: Internally, the function calls rdbuf()->open(filename,mode|ios_base::out). The function clears the stream's state flags on success (setting them to goodbit). In case of failure, failbit is set.
It is a predefined function in "conio.h" (console input output header file) used to clear the console screen. It is a predefined function, by using this function we can clear the data from console (Monitor). Using of clrscr() is always optional but it should be place after variable or function declaration only. It is often used at the beginning of the program (mostly after variable declaration but not necessarily) so that the console is clear for our output.
The getch() is a predefined non-standard function that is defined in conio.h header file. It is mostly used by the Dev C/C++, MS- DOS's compilers like Turbo C to hold the screen until the user passes a single value to exit from the console screen. It can also be used to read a single byte character or string from the keyboard and then print. It does not hold any parameters. It has no buffer area to store the input character in a program. The getch() function does not accept any parameter from the user. It returns the ASCII value of the key pressed by the user as an input.
A program shall contain a global function named main, which is the designated start of the program in hosted environment. main() function is the entry point of any C++ program. It is the point at which execution of program is started. When a C++ program is executed, the execution control goes directly to the main() function. Every C++ program have a main() function.
Positions cursor in text window. The gotoxy() function places the cursor at the desired location on the screen. This means it is possible to change the cursor location on the screen using the gotoxy() function. It is basically used to print text wherever the cursor is moved. If the coordinates are in any way invalid the call to gotoxy is ignored. Neither argument to gotoxy can be zero.
delay() function is used to hold the program's execution for given number of milliseconds, it is declared in dos.h header file. There can be many instances when we need to create a delay in our programs. C++ provides us with an easy way to do so. We can use a delay() function for this purpose in our code. We can run the code after a specific time in C++ using delay() function.
setbkcolor() function is used to set the background color in graphics mode. The default background color is black and default drawing color as we know is white. setbkcolor() function takes only one argument it would be either the name of color defined in graphics.h header file or number associated with those colors. If we write setbkcolor(yellow) it changes the background color in Green. The possible color values are from 0 - 15 black, blue, green, cyan, red, magenta, brown, lightgray, darkgray, lightblue, lightgreen, lightcyan, lightred, lightmagenta, yellow, white and blink (128).
Settextstyle function is used to change the way in which text appears, using it we can modify the size of text, change direction of text and change the font of text. settextstyle sets the text font, the direction in which text is displayed, and the size of the characters. A call to settextstyle affects all text output by outtext and outtextxy.
The cout is a predefined object of ostream class. It is connected with the standard output device, which is usually a display screen. The cout is used in conjunction with stream insertion operator (<<) to display the output on a console. On most program environments, the standard output by default is the screen, and the C++ stream object defined to access it is cout. The "c" in cout refers to "character" and "out" means "output". Hence cout means "character output". The cout object is used along with the insertion operator << in order to display a stream of characters.
Flush stream. The fflush() function in C++ flushes any buffered data to the respective device. Buffered data is the temporary or application specific data stored in the physical memory of the computer until a certain time. If the given stream was open for writing (or if it was open for updating and the last i/o operation was an output operation) any unwritten data in its output buffer is written to the file. If stream is a null pointer, all such streams are flushed. In all other cases, the behavior depends on the specific library implementation. In some implementations, flushing a stream open for reading causes its input buffer to be cleared (but this is not portable expected behavior).
#include is a way of including a standard or user-defined file in the program and is mostly written at the beginning of any C/C++ program. This directive is read by the preprocessor and orders it to insert the content of a user-defined or system header file into the following program. These files are mainly imported from an outside source into the current program. The process of importing such files that might be system-defined or user-defined is known as File Inclusion. This type of preprocessor directive tells the compiler to include a file in the source code program.
In C++ programming we are using the iostream standard library, it provides cin and cout methods for reading from input and writing to output respectively. To read and write from a file we are using the standard C++ library called fstream. Let us see the data types define in fstream library is: • ofstream: This data type represents the output file stream and is used to create files and to write information to files. • ifstream: This data type represents the input file stream and is used to read information from files. • fstream: This data type represents the file stream generally, and has the capabilities of both ofstream and ifstream which means it can create files, write information to files, and read information from files.
Rename file. Changes the name of the file or directory specified by oldname to newname. This is an operation performed directly on a file; No streams are involved in the operation. If oldname and newname specify different paths and this is supported by the system, the file is moved to the new location. If newname names an existing file, the function may either fail or override the existing file, depending on the specific system and library implementation. Proper file access shall be available.
setcolor() function is used to set the foreground color in graphics mode. After resetting the foreground color you will get the text or any other shape which you want to draw in that color. setcolor sets the current drawing color to color, which can range from 0 to getmaxcolor. The current drawing color is the value to which pixels are set when lines, and so on are drawn. The drawing colors shown below are available for the CGA and EGA, respectively.
The header file graphics.h contains cleardevice() function. cleardevice() is a function which is used to clear the screen by filling the whole screen with the current background color. It means that cleardevice() function is used to clear the whole screen with the current background color and it also sets the current position to (0,0). Both clrscr() and cleardevice() functions are used to clear the screen but clrscr() is used in text mode and cleardevice function is used in the graphics mode.
To store Student details like student 'name', student 'roll num', 'student age'. You have 2 ways to do it, one way is to create different variables for each data, but the downfall of
Operators declared on the type list. Reading a list from input. Writing a list on the output. Gets a list and returns its length. Getting an element and returns its positon in the list. If
In this C++ example, we have "two functions" one gets the values from user, assign them to structure members and returns the structure and the other function takes that structure as
