#include
"conio.h"
main()
{
//PROGRAM
AIM : the display on the screen becomes hazy,
// to get normal screen display
press any key
char far *vdu;
int i,j;
vdu=(char far*)0xb8000000l;
while(!kbhit())
{
for(j=0;j<14000;j++);
// for(l=0;l<5000;l++);
for(i=0;i<3999;i+=2)
{
if(*(vdu+i) >=
'A' && *(vdu+i) <= 'Z')
*(vdu+i)+=32;
else
{
if(*(vdu+i)
>= 'a' && *(vdu+i) <= 'z')
*(vdu+i)-=32;
}
}//for
}//while
return 0;
}//main