文件名称:readstring
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<fstream> 类通过重载 >> 操作符来读取文件,重载 << 操作符向文件写入数据。每个操作符都有几个重载的版本,分别用于各种内建的数据类型。-<fstream> category through the overloaded>> operator to read files, overloaded <<operator writes data to the document. Each operator has several overloaded versions, respectively, for a variety of built-in data types.
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从文件中读取字符串.txt