lineto() function
lineto function draws a line from current position(CP) to the point(x,y), you can get current position using getx and gety function.
C programming code for lineto()
#include<graphics.h>
#include<conio.h>
main()
{
int gd = DETECT, gm;
initgraph(&gd, &gm, "C:\\ TurboC3\\BGI"); moveto(100, 100);
lineto(200, 200);
getch();
closegraph();
return 0;
}