C++ program to draw concentric color-filled circles
kw.cpp
#include <graphics.h>
int main()
{
    int gd = 0, gm = 9, i, color = 1;
    initgraph(&gd, &gm, NULL);
    {
        for (i = 10; i <= 200; i = i + 15)
        {
            setcolor(color++);
            pieslice(320, 240, 0, 360, i);
            delay(100);
        }
        int gd = 0, gm = 9, i, color = 1;
        for (i = 200; i >= 10; i = i - 15)
        {
            setcolor(color++);
            pieslice(320, 240, 0, 360, i);
            delay(100);
        }
    }
    delay(7000);
    return 0;
}
Output
kodingwindow@kw:~$ g++ kw.cpp -lgraph
kodingwindow@kw:~$ ./a.out
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