c++ - 我的问题 = 直到用户按下 "enter"从 C++ 中的用户输入取平均值

Question

此代码计算从用户输入整数到用户输入“666”整数的平均值。但是，我想让它在用户按下回车键时停止。我怎样才能做到这一点？

#include <iostream>

using namespace std; //s

int main()

{
int total = 0, counter = 0, number, average;

    do
    {


    cin >> number;
    if(number == 666) //what should i do to make enter button instead of 666?
    {
        average = total / counter;
        cout << average;
        return 0;

    }
    total = total + number;
    counter = counter + 1;

} while(1);

return 0;

}

Answer 1

遗憾的是，如果 <ENTER> 无法轻松检查按钮已被按下。 cin读取格式化输入(在你的情况下是数字)并忽略其他所有内容(包括空格，如换行符)。解决您的问题的方法是读取整行并从中提取数字:

#include <iostream> // cin, cout
#include <sstream> // istringstream
#include <string> // getline

int main()
{
    // Reading a line from the standard input to the variable 'line'.
    std::string line;
    std::getline(std::cin, line);

    // The easiest way to get the numbers from 'line' is to wrap it in an
    // 'istringstream'. Now, you can use 'iss' just like 'cin'.
    std::istringstream iss{line};

    double total = 0.0;
    double counter = 0.0;
    for (double number; iss >> number; ++counter) {
        total += number;
    }
    std::cout << "Avarage: " << total / counter << '\n';

    return 0;
}