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由 Rich Felker 提交于
the (obsolete) standard allows either 0 or 1 for the decimal point location in this case, but since the number of zero digits returned in the output string (in this implementation) is one more than the number of digits the caller requested, it makes sense for the decimal point to be logically "after" the first digit. in a sense, this change goes with the previous commit which fixed the value of the decimal point location for non-zero inputs.
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