Added DDA with 3 points

DDA3POINTS.C

@@ -0,0 +1,60 @@
+#include<stdio.h>
+#include<conio.h>
+#include<dos.h>
+#include<graphics.h>
+void main(){  
+
+	int gd = DETECT ,gm, i;  
+	float x, y,dx,dy,steps,steps1,x3,y3,dx1,dy1;  
+	int x0, x1, y0, y1,x2,y2;  
+	initgraph(&gd, &gm, "C:\\TURBOC3\\BGI");
+	x0 = 100 , y0 = 200, x1 = 400, y1 = 200,x2=600,y2=400;
+	dx = (float)(x1 - x0);
+	dy = (float)(y1 - y0);
+	dx1=(float)(x2-x1);
+	dy1=(float)(y2-y1);
+	if(dx>=dy)
+			{
+		steps = dx;
+	}
+	else
+			{
+		steps = dy;
+	}
+	dx = dx/steps;
+	dy = dy/steps;
+	x = x0;
+	y = y0;
+	i = 1;
+	while(i<= steps)
+	{
+		putpixel(x, y, WHITE);
+		x += dx;
+		y += dy;
+		i=i+1;
+	}
+if(dx1>=dy1)
+			{
+		steps1 = dx1;
+	}
+	else
+			{
+		steps1 = dy1;
+	}
+	dx1 = dx1/steps1;
+	dy1 = dy1/steps1;
+	x3 = x1;
+	y3 = y1;
+	i = 1;
+	while(i<= steps1)
+	{
+		putpixel(x3, y3, BLUE);
+		x3 += dx1;
+		y3 += dy1;
+		i=i+1;
+	}
+	getch();
+	closegraph();
+}
+
+