关于getline将输入流的内容读入到string变量时要敲两个回车的问题

最新推荐文章于 2025-12-01 06:10:14 发布

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本文介绍VC6.0中getline()函数存在的Bug，即多读取一个字符的问题，并提供了解决方案。该问题在敲击回车后会导致程序多等待一次输入才输出内容。修正方法涉及修改系统头文件string中的getline成员函数。

while (getline(cin, line))
cout << line << endl;
本该在敲回车后，输出line的内容，但是虚多敲一个回车才达到目的。这是vc6.0的一个bug，在vs中此问题不存在。

通过多读一次char的方法放掉这个回车符，这个在C++编程思想里有很详细的解释。

FIX: getline Template Function Reads Extra Character RESOLUTION Modify the getline member function, which can be found in the following system header file "string", as follows: else if (_Tr::eq((_E)_C, _D)) {_Chg = true; // _I.rdbuf()->snextc(); // Remove this line and add the line below. _I.rdbuf()->sbumpc(); break; } STATUS Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article. This problem was corrected in Microsoft Visual C++ .NET. MORE INFORMATION The following sample program demonstrates the bug: //test.cpp #include <string> #include <iostream> int main () { std::string s,s2; std::getline(std::cin,s); std::getline(std::cin,s2); std::cout << s <<'/t'<< s2 << std::endl; return 0; } //Actual Results: Hello<Enter Key> World<Enter Key> <Enter Key> Hello World //Expected Results: Hello<Enter Key> World<Enter Key> Hello World -------------------------------------------------------------------------------- APPLIES TO • The Standard C++ Library, when used with: Microsoft Visual C++ 6.0 Enterprise Edition Microsoft Visual C++ 6.0 Professional Edition Microsoft Visual C++ 6.0 Standard Edition