为什么在我包含 cin.get() 后控制台会关闭?

2021-12-14 00:00:00 c++ visual-studio-2010

我刚刚开始使用 C++ Primer Plus 学习 C++，但我在其中一个示例中遇到了问题.就像书中指示的那样，我在末尾包含了 cin.get() 以防止控制台自行关闭.但是，在这种情况下，除非我添加两个我不理解的 cin.get() 语句，否则它仍然会自行关闭.我使用的是 Visual Studio Express 2010.

I've just started learning C++ using C++ Primer Plus but I'm having trouble with one of the examples. Like the book instructed I included cin.get() at the end to prevent the console from closing by itself. However, in this instance it still closes by itself unless I add two cin.get() statements which I don't understand. I'm using Visual Studio Express 2010. 

#include <iostream>

int main()
{
    int carrots;

    using namespace std;
    cout << "How many carrots do you have?" << endl;
    cin >> carrots;
    carrots = carrots + 2;
    cout << "Here are two more. Now you have " << carrots << " carrots.";
    cin.get();
    return 0;
}

推荐答案

cin >> carrots;

这一行在输入流中留下一个尾随换行符，然后被下一个 cin.get() 使用.在此之前直接执行一个简单的 cin.ignore() :

This line leaves a trailing newline token in the input stream, which then gets consumed by the next cin.get(). Just do a simple cin.ignore() directly before that:

cin.ignore();
cin.get();

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