double SumPrice = 0;
SumPrice = "roomprice" * "indays" - "deposit"; SumPrice = "ro
SumPrice = "roomprice" * "indays" - "deposit"; SumPrice = "ro
阅读背景：
求教：运算符 "* "无法应用于 string 和 string 类型的操作数 怎么解决？
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