C++ program to draw concentric circles using for loop
gd.cpp
#include <graphics.h>
int main()
{
    int gd = 0, gm = 9, i;
    initgraph(&gd, &gm, NULL);
    for (i = 50; i <= 100; i = i + 15)
    {
        setcolor(15);
        circle(150, 150, i);
        delay(200);
    }
    delay(5000);
    return 0;
}
Output
godarda@gd:~$ g++ gd.cpp -lgraph
godarda@gd:~$ ./a.out
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