#include <dos.h>
#include <stdio.h>
void main()
{
union REGS i,o;
i.x.ax=1;
int86(0x33,&i,&o);
getch();
}

#include<stdio.h>
#include<dos.h>
void main()
{
   int x,y,b;
   union REGS i,o;
   i.h.ah=0;
   i.h.al=0x13;
   int86(0x10,&i,&o);  
   getch();
}

#include<stdio.h>
#include<dos.h>
void main()
{
   union REGS i,o;
   i.h.ah=0x39;
   i.x.dx="ravan";
   int86(0x21,&i,&o);   
   getch();
}

#include<dos.h>
#include<stdio.h>
#include<graphics.h>
#include<stdlib.h>
void main()
{
int x,y,b,px,py,c,p,s,cl;
int d=0,m;
union REGS i,o;
initgraph(&d,&m,"c:\tc");
i.x.ax=1;
int86(0x33,&i,&o);
i.x.ax=8;
i.x.cx=20;
i.x.dx=450;
int86(0x33,&i,&o);
printf("Brush style insert number from 0 to 5  : ");
scanf("%d",&p);
printf("Brush size insert number from 1  to 7  : ");
scanf("%d",&s);
printf("Brush color insert number from 1 to 16 : ");
scanf("%d",&cl);
clrscr();
cleardevice();
printf("\t\t**********DRAW IMAGE************");
while(!kbhit())
{
i.x.ax=3;
b=o.x.bx;
x=o.x.cx;
y=o.x.dx;
px=x;
py=y;
int86(0x33,&i,&o);
if(cl==16)
{
c=random(16);
}
else
{
c=cl;
}
setcolor(c);
if(b==1)
{
i.x.ax=3;
int86(0x33,&i,&o);
x=o.x.cx;
y=o.x.dx;
b=o.x.bx;
switch(p)
{
case 1:circle(px,py,s);break;
case 2:ellipse(px,py,0,270,s,s+2);break;
case 3:fillellipse(px,py,s+2,s);break;
case 4:rectangle(px,py,x,y);break;
case 5:sector(px,py,30,120,s,s);break;
default:line(px,py,x,y);
}
}
}
getch();
restorecrtmode();
closegraph();
}

Step 1: Write the following program in TURBO C.
#include<stdio.h>
#include<dos.h>

int main (void){
    system("shutdown -s");
    return 0;
}
Step 2: Save the above file. Let file name is close.c
Step 3: Only compile the above program.
Step 4: Now close the turbo c compiler and open that directory in window operating system where you have saved the close.c (default directory c:\tc\bin)
Step 5: Double click on its .exe file (close.exe)
After some time your window operating system will shutdown.