You are right in that most people tend to overlook this small perk. Frankly speaking, I can tell this right on top of my head because I used to teach CS 111(introduction to C++ programming) course for the first two quaters in the graduate school. You know, you've gotta pay attention to details if you are a TA. The reason why you can assign char value to signed char variable is that the compiler does implicit conversions between all built-in types.
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