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21. #include conio.h
main(void)
{
textmode(3);
textbackground(GREEN);
clrscr();
window(10, 10, 35, 20);
textbackground(BLUE);
clrscr();
textcolor(LIGHTCYAN);
cprintf(Hello world);
gotoxy(5,2);
cprintf(Chiangmai );
textcolor(YELLOW | BLINK);
cprintf(THAILAND);
textbackground(RED);
cprintf(rn123.456);
getch();
}
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26. #include stdio.h
#include dos.h
main(void)
{
unsigned char key;
int ofs1,ofs2;
ofs1 = peek(0x40, 0x1a); /*base keyboard buffer offset*/
ofs2 = peek(0x40, 0x1c);
while(1)
{
do
{
key = inportb(0x0060);
if(key = 128) nosound();
}
while(key = 128);
poke(0x40, 0x1a, ofs1); /* keyboard buffer*/
poke(0x40, 0x1c, ofs2); /* offset reset */
switch( key )
{
case 2 : sound(262); delay(100); break;
case 3 : sound(294); delay(100); break;
case 4 : sound(330); delay(100); break;
case 5 : sound(349); delay(100); break;
case 6 : sound(392); delay(100); break;
case 7 : sound(440); delay(100); break;
case 8 : sound(494); delay(100); break;
case 9 : sound(523); delay(100); break;
case 1 : nosound(); exit(0);
}
}
}
/* middle c
C4=262Hz
D4=294Hz
E4=330Hz
F4=349Hz
G4=392Hz
A4=440Hz
B4=494Hz
C5=523Hz
(c) January 2007
gumtorn ruanfaigad
All rights reserved.
*/

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28. #include graphics.h
int x, y, c;
main()
{
clrscr();
initgraph(VGA,VGAHI,);
/* LIGHTRED circle */
setcolor(LIGHTRED); circle(100,100,100);
getch();
/* LIGHTGREEN rectangle */
setcolor(LIGHTGREEN); rectangle(210,0,410,200);
getch();
/* LIGHTRED bar */
setfillstyle(SOLID_FILL, LIGHTRED); bar(220,10,400,190);
getch();
/* LIGHTRED circle with LIGHTRED floodfill */
setcolor(LIGHTRED); circle(100,210,100);
setfillstyle(SOLID_FILL, LIGHTCYAN); floodfill(100,210, LIGHTRED);
getch();
/* LIGHTMAGENTA line */
setcolor(LIGHTMAGENTA); line(0,300,100,400);
getch();
/* hello world text */
setcolor(YELLOW); outtextxy(500,0,Hello World);
getch();
/* RMUTL text */
setcolor(LIGHTCYAN);
settextstyle(SANS_SERIF_FONT,HORIZ_DIR,10);
outtextxy(200,350,RMUTL);
getch();
/* LANNA text */
setcolor(LIGHTRED);
settextstyle(TRIPLEX_FONT,VERT_DIR,8);
outtextxy(500,40,LANNA);
getch();
c=0;
do{
for( x = 0; x 639; x++)
for(y = 470; y 479; y++)
putpixel(x, y, ((x+c) / 32) );
c = c+1;
}while(!kbhit());
getch();
closegraph();
}

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