C program to make rectangle using line function- #include<graphics.h> #include<conio.h> void main() { int gd=DETECT, gm; clrscr(); initgraph(&gd,&gm,"c:\\turboc3\\bgi"); setcolor(3); line(30,15,100,15); line(30,100,30,15); line(30,100,100,100); line(100,100,100,15); getch(); }