Header file:
    graphics.h
Synopsis:
      void initgraph (int *gd, int *gm, char *path);
     gd  - pointer to graphic driver
     gm - pointer to graphic mode 
     path - directory path where initgraph looks for graphic driver
Description:
     initgraph() loads the graphic system from disk then puts the system into graphic mode.
initgraph function in c graphics
#include <conio.h>
#include <graphics.h>
#include <dos.h>
int main() {
/* request auto detection */
int graphicDriver = DETECT, graphicMode;
int i, err, midx, midy;
int circleRadius = 150, arcRadius = 150;
initgraph(&graphicDriver, &graphicMode, "C:/TURBOC3/BGI");
err = graphresult();
if (err != grOk) {
/* error occurred */
printf("Graphic Error: %s\n",
grapherrormsg(err));
return 0;
}
/* mid position in x and y-axis */
midx = getmaxx() / 2;
midy = getmaxy() / 2;
for (i = 15; i > 0; i--) {
/* sets the current drawing color */
setcolor(i);
/* setting the current fill style */
setfillstyle(SOLID_FILL, i);
/* drawing circle at the middle of the screen */
circle(midx, midy, circleRadius);
/* fill the bounded area using the given color */
floodfill(midx, midy, i);
                /* drawing arcs at the four end of the screen */
                arc(0, 0, 270, 360, arcRadius);
                floodfill(0, 0, i);
                arc(getmaxx(), 0, 180, 270, arcRadius);
                floodfill(getmaxx(), 0, i);
                arc(0, getmaxy(), 0, 90, arcRadius);
                floodfill(0, getmaxy(), i);
                arc(getmaxx(), getmaxy(), 90, 180, arcRadius);
                floodfill(getmaxx(), getmaxy(), i);
                circleRadius = circleRadius - 10;
                arcRadius = arcRadius - 10;
                delay(400);
        }
        getch();
        /* clean up */
        closegraph();
        return 0;
  }
Output: (initgraph built-in function in c graphics.h)
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