make fold.expresion.cpp
work with negative values
#268
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resolve #267
Description
Please describe the motivation of this pull request, and what problem was solved in this PR.
Change List
Reference
I added a
static_cast<double>
to make it work with negative values.说明
此处详细说明 PR 的动机是什么、解决了什么样的问题。
变化箱单
参考文献
如果有请注明