c++ifstream打开文件返回错误码

c++ ifstream打开文件返回错误码的方式是通过检查ifstream对象的fail()函数的返回值。如果返回true，则表示文件打开失败；如果返回false，则表示文件打开成功。在引用中的代码中，如果readFile.fail()返回true，就说明文件读取失败。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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