#include <stdio.h>
#include <conio.h>
#include <graphics.h>
#include <dos.h>
int main() {
/* request auto detection */
int gdriver = DETECT, gmode, err;
int i, j, midx, midy, radius, temp;
/* initialize graphic mode */
initgraph(&gdriver, &gmode, "C:/TURBOC3/BGI");
err = graphresult();
if (err != grOk) {
/* error occurred */
printf("Graphics Error: %s\n",
grapherrormsg(err));
return 0;
}
/* mid position of x and y axis */
midx = getmaxx() / 2;
midy = getmaxy() / 2;
radius = 10;
for (i = 1; i <= 15; i++) {
radius = radius + 15;
temp = radius;
/* draws concentric circles from in to out */
for (j = i; j >= 1; j--) {
setcolor(j);
setfillstyle(SOLID_FILL, j);
circle(midx, midy, temp);
floodfill(midx, midy, j);
temp = temp - 15;
}
sleep(1);
}
/* clears graphic screen */
cleardevice();
/* draws concentric circles out to in */
for (i = 15; i >= 1; i--) {
setcolor(i);
setfillstyle(SOLID_FILL, i);
circle(midx, midy, radius);
floodfill(midx, midy, i);
radius = radius - 15;
delay(250);
}
getch();
/* deallocate memory allocated for graphic screen */
closegraph();
return 0;
}
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