Reproducibility of Results
Given the same set of inputs (with the same values and time sequence), a digital circuit properly designed produces exactly where the same results. The outputs an analog circuit varies with temperature, supply voltages, aging of components, among other factors.
The digital design, often referred to as "project logic", of course. Are not necessary mathematical aptitudes specials, and the behavior of small logic circuits can be visualized mentally without which wants special knowledge about the functioning of capacitors, transistors or any other devices requiring calculations for be modeled.
Flexibility and Functionality
Once reduced to digital form, a problem can be solved using a set of logical steps in space and time. For example, we can design a circuit that encodes a voice recording so that it is completely unreadable by anyone who does not have the "key" (password), but can be heard, virtually no distortion, by those who know. In analog systems this is a very complex issue that can not be put in the same terms.
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