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#include 
main() 
{int gdriver=DETECT,gmode; 
initgraph(&gdriver,&gmode,"c:\\tc"); 
cleardevice(); 
line(160,120,480,120); 
line(480,120,480,360); 
line(480,360,160,360); 
line(160,360,160,120); 
getch(); 
closegraph(); 
}