You don't: the C and C++ languages do not have any built-in graphics tool. Further, it is impossible to draw a concentric circle. Multiple circles are concentric when they share the same center.
In C or C++, graphic functions such as the drawing of lines, rectangles or circles are provided through third party libraries, or through wrappers which provide access to the operating system's graphics functions.
A concentric circle.
Concentric Circles?
A concentric circle looks like a bullseye or a target. It is a big circle with littler circles inside of it with the same centerponit
Concentric Circle
concentric
Concentric circles, are circles within circles. Each concentric circle on the surface of a disk represents a track, the narrower the circle is, the more data can be stored on the disk.
A circle inside another circle is called a concentric circle. This means that the circles share the same center point, with one circle contained entirely within the other.
track
Non concentric circles are circles that do not share the same center point.
The use of concentric circles is most commonly used on a target. Concentric circles are placed around a target in which each concentric circle has the same center.
concentric circles
Eccentric circles.