问题描述
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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