ifstream中的open

ifstream中的open函数的作用是打开文件，并将文件与流对象关联起来。open函数有两个参数，第一个参数是字符串，表示要打开的文件的地址或名称，第二个参数是打开方式，用来指定文件的读取模式。常见的打开方式有ios::in(读取模式)、ios::out(写入模式)、ios::app(追加模式)等。通过调用open函数，可以将文件的内容读取到流对象中，以便后续操作。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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