当从键盘输入数据时，当用户在C ++中按“输入”时如何完成输入？

Question

The problem is, in C++, I hope to get numbers from user and put every int to an vector. So I write the following code:

#include <iostream>
#include <vector>
using namespace std;

vector<int> readVals()
{
    vector<int> read;
    int temp;
    cin >> temp;
    while (!cin.fail() && !cin.eof())
        {
            read.push_back(temp);
            cin >> temp;
        }
    return read;
}

void printVals(vector<int> v)
{
    if(v.size() >= 1)
        {
            for (vector<int>::size_type i = 0; i < v.size()-1; i++ )
        {
            cout << v[i] << " ";
            cout << v[v.size()-1] << "\n";
        }
    }
}

int main()
{
    vector<int> a = readVals();
    printVals(a);
    return 0;
}

Then, I compile it to create an a.out file. I have some numbers in in1 . And when I do the command: a.out < in1 , I got what I want. But I'm confused when I hope the data can be inputted by user. The user can input some numbers and press Enter to pass the numbers in. However, I used getline() , failed. !="\\n" , failed. Everytime when I press Enter , it seems that the program is still waiting for more numbers and not print out the result. Does any one can help me to make it successfully? Thank you!

Answer 1

Your loop is waiting for cin to be in a "failed" state or at the end of file. Hitting enter does neither. You can end the input by hitting CTRL-Z on windows or CTRL-D on unix/mac. These send the "End of file" character to cin. Alternatively, change your loop condition to "listen" for some specific input.