C++ostream 为何输出到屏幕的与书上说的不一样呢

 #include <iostream>

int main()
{
    using namespace std;
    int carrots;
    cout << "how many carrots do you have?" << endl;
    cin >> carrots;
    cout << "here are two more.";
    carrots = carrots + 2;
    cout << "Now you have " << carrots << "carrots." << endl;
    return 0;
}

按理说我应该看到这样的结果：
how many carrots do you have?
12
here are two more.now you have 14 carrots.

但是我只有这一行
how many carrots do you have?
底下的就没有了

那你在屏幕上输入 12 然后回车。。。

 cin >> carrots;

这里在等待你的控制台输入，你需要输入一个数字，然后回车，这一行代码才能继续。同时把你的输入赋值给变量carrots