If the numeric quantity were stored and manipulated as pure binary, interfacing to such a display would require complex circuitry. This matches much more closely the physical reality of display hardware-a designer might choose to use a series of separate identical seven-segment displays to build a metering circuit, for example. By employing BCD, the manipulation of numerical data for display can be greatly simplified by treating each digit as a separate single sub-circuit. BCD is very common in electronic systems where a numeric value is to be displayed, especially in systems consisting solely of digital logic, and not containing a microprocessor.