#include<stdio.h>
#include<graphics.h>
#include<math.h>
void main()
{

 int gd=DETECT, r, gm, d, x1, y1, x2, y2, xn1, yn1, xn2, yn2;
    float ra, si, co;
    initgraph(&gd, &gm, "C:\\TURBOC3\\BGI");

    printf("Enter the value of X1 and Y1: ");
    scanf("%d %d", &x1, &y1);

    printf("Enter the value of X2 and Y2: ");
    scanf("%d %d", &x2, &y2);

    line(x1, y1, x2, y2);

    printf("Enter the degree of rotation: ");
    scanf("%d", &d);

    //Starting point would be same
    xn1 = x1;
    yn1 = y1;

    //Convert Degree into radian
    r = x2-x1;
    ra = 0.0175 * d;
    si = sin(ra);
    co = cos(ra);
    //second point
    xn2 = x1 + r*co + 1;
    yn2 = y1 + r*si + 1;

 line(xn1, yn1, xn2, yn2);
 getch();
 closegraph();
}