#include<stdio.h>
  #include<conio.h>
  #include<math.h>
  #include<graphics.h>
  float a[3][3];
  float b[3][3];
  float c[3][3];
  #define pi 3.14

  void main()
	  {
	    int gm = DETECT;
	    int gd = DETECT;

	    float x,y,sum;
	    int i,j,k,xa,ya,xb,yb;
	    initgraph(&gd,&gm,"c:\\tc\\bgi");
	    printf("Enter the angle x:- ");
	    scanf("%f",&x);
	    y = ( pi/180 ) * x;

	    a[0][0] = cos(y);
	    a[0][1] = -sin(y);
	    a[0][2] = 0;
	    a[1][0] = sin(y);
	    a[1][1] = cos(y);
	    a[1][2] = 0;
	    a[2][0] = 0;
	    a[2][1] = 0;
	    a[2][2] = 1;
	    printf("Enter the co-ordinate xa and ya:- ");
	    scanf("%d%d",&xa,&ya);
	    printf("Enter the co-ordinate xb and yb:- ");
	    scanf("%d%d",&xb,&yb);
	    line(xa,ya,xb,yb);
		getch();
	    b[0][0] = xb;
	    b[0][1] = 0;
	    b[0][2] = 0;
	    b[1][0] = yb;
	    b[1][1] = 1;
	    b[1][2] = 0;
	    b[2][0] = 1;
	    b[2][1] = 0;
	    b[2][2] = 1;

		for(i=0; i<=2; i++)
		 {
			for(j=0; j<=2; j++)
			   {
			sum=0;
				 for(k=0; k<=2; k++)
				    {
					sum = sum + (a[i][k] * b[k][j]);
				    }
				c[i][j] = sum;
			   }
		 }
	    line(xa,ya,c[0][0],c[1][0]);
		getch();
  }