Write a C program to draw a line using graphics video memory and far pointer?

Answer 1

Segment number 0XA is known as graphics video memory. This segment has 720 columns and 400 rows. Intersection of rows and columns is known as pixel. Size of each pixel is one byte which stores color information.

#include <dos.h>
#include<stdio.h>
 int main() 
{
 int j;
 union REGS i,o;
 char far *ptr=(char *)0XA0000000;
 i.h.ah=0;
 i.h.al=0x13;
 int86(0x10,&i,&o);
 for(j=1;j<=100;j++)
 {
 *(ptr+j)=4;
 }
    return 0; 
}