C Program to viewport clipping and lines with different colors line styles and co- ordinates

#include<graphics.h> 
#include<conio.h> 
#include<stdlib.h> 
#include<dos.h> 
#include<stdio.h> 
void main() 
{ 
int gm, gd=DETECT; 
int x1,x2,y1,y2,c,i; 
clrscr(); 
printf(“enter starting co-ordinates of viewport (x1,y1)/n”); 
scanf(“%d%d”,&x1,&y1); 
printf(“enter ending co-ordinates of viewport(x2,y2)/n”); 
scanf(“%d%d”,&x2,&y2); 
initgraph(&gd,&gm,””); 
rectangle(x1,y1,x2,y2); /*to show the boundary of viewport */ 
setviewport(x1,y1,x2,y2,1); /* view port is set and any drawing now onwards 
must be drawn within the viewport only */ 
while(1kbhit()) /*until pressing any key this continues */ 
{ 
/* Rectangle coordinates are taken randomly */
x1=rand()%getmaxx(); 
x2=rand()%getmaxx(); 
y1=rand()%getmaxy(); 
y2=rand()%getmaxy(); 
setlinestle(rand()%10, rand()%20); 
setcolor(rand()%16); /*to set the line color */ 
line(x1,y1,x2,y2); /*to draw the line */ 
delay(200); 
} 
getch(); 
closegraph(); /*closes the graph mode */ 
}