A brittle material will not exhibit a yield point. In other words, the yield point and failure point coincide. In such cases, the yield strain and failure strain (also known as ultimate strain or elongation) are the same value. On the other hand, ductile materials have a failure strain that is significantly greater than the elastic strain, as shown in the figure below.
(from quora.com)
Write a function to determine the qualitative brittleness of the material by calculating the ratio of elastic strain to failure strain. A ratio of one indicates complete brittleness, whereas a ratio close to zero indicates essentially no brittleness.
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These are some pretty nice problems --- very simple, of course, but I commend you for giving some context and introducing Cody players to a new field!