LINE USING BRESENHAM

/*CSEMATTER.BLOGSPOT.IN
PROGRAM NAME-PROGRAM TO DRAW A LINE USING BRESENHAM ALGORITHM*/

#include<stdio.h>
#include<conio.h>
#include<graphics.h>
int main()
{
      int gd = DETECT, gm;
      int dx, dy, p, end;
      float x1, x2, y1, y2, x, y;
      printf("Enter Value of X1: ");
      scanf("%f", &x1);
      printf("Enter Value of Y1: ");
      scanf("%f", &y1);
      printf("Enter Value of X2: ");
      scanf("%f", &x2);
      printf("Enter Value of Y2: ");
      scanf("%f", &y2);
 if ( x1 > x2 )
   {x = x2;
    y = y2;
    end= x1;}
   else
   { x = x1;
y = y1;
end = x2;}
      dx = abs(x1 - x2);
      dy = abs(y1 - y2);
      p = 2 * dy - dx;
    initgraph(&gd, &gm, "c:\tc\bgi");
      putpixel(x, y, 10);
      while(x < end)
      { x = x + 1;
            if(p < 0)
           p = p + 2 * dy;
            else
                {  y = y + 1;
                  p = p + 2 * (dy - dx);}
            putpixel(x, y, 10);}
      getch();
      closegraph();}