Variable 'Std:ofstream' Has Initializer but Incomplete Type

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variable 'std:ofstream’ has initializer but incomplete type

或者是 variable 'std:ifstream’ has initializer but incomplete type

其原因是因为没有包含fstream这个头文件。

#include #include #include using namespace std; int
main() { fstream f(“filename”); f << 20; f.close(); }
上面这段代码如果没有那个就会有标题的错误。