ifstream头文件

在C++中，如果要使用ifstream类来进行文件输入操作，需要包含<fstream>头文件。这个头文件中定义了ifstream类的相关函数和成员变量，使得我们可以进行文件的读取操作。例如，可以使用ifstream对象打开文件，读取文件内容并将其赋值给字符串变量，然后关闭文件。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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