dda

#include<stdio.h>
#include<math.h>
#include<conio.h>
#include<graphics.h>
#include<time.h>
int main()
{
    int gd=DETECT,gm;
    initgraph (&gd,&gm,"");
    float x, y, x1, y1, x2, y2, dx, dy, step;
    int i;

    printf("Enter x1 and y1:\n");
    scanf ("%f %f", &x1, &y1);

    printf("Enter x2 and y2:\n");
    scanf ("%f %f", &x2, &y2);

    dx = (x2 - x1);
    dy = (y2 - y1);

    if(dx >= dy)
    {
        step = dx;
    }

    else
        step = dy;

    dx = dx/step;
    dy = dy/step;

    x = x1;
    y = y1;


 printf("Values of x and y:\n ");

    for(i = 1;i <= step; i++)
    {
        x = x + dx;
        y = y + dy;

        printf("%f %f \n", round(x) , round(y));
        putpixel(round(x) , round(y),WHITE);
        delay(10);
    }
     getch();
     closegraph();
}