7A. Perform 2D Rotation on a given object.

#include<graphics.h>
#include<iostream.h>
#include<conio.h>
#include<math.h>
void main()
{
int x1,y1,x2,y2,xn,yn;
double th;
float t;
int gd=DETECT,gm;
initgraph(&gd,&gm,"C:\\TurboC3\\BGI");
cout<<"Enter the first co-ordinate:";
cin>>x1>>y1;
cout<<"Enter second co-ordinate:";
cin>>x2>>y2;
line(x1,y1,x2,y2);
cout<<"Enter the angle:";
cin>>th;
t=(22*th)/(180*7);
xn=abs((x2*cos(t))-(y2*sin(t)));
yn=abs((x2*sin(t))+(y2*cos(t)));
line(x1,y1,xn,yn);
getch();
closegraph();
}