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用了atof（）函数，一直报错，不知道咋回事，求大神解答
应该可以用强制数据类型转换。用()加类型强制转换应该就可以了
试了一下，看起来这么操作不行
你的字符串是单纯的字符串还是夹杂有数字的字符串？
