C ++：如何在控制台窗口中显示结果

Question

#include <iostream>
using namespace std;

int main()
{
    int sum = 0;

    cout << "Please input a series of integers and any number of spaces: ";

    int i;
    while( cin >> i )
    {
        sum += i;
        while( cin.peek() == ' ' ) // isolate spaces
        {
            cin.get();
        }

        if( cin.peek() == '\n') // when press "enter"
        {
            break; // get out of loop
        }
    }

    cout << "The result is: " << sum << endl;
    cin.get();
    return 0;

}

Above is my code. I try to use cin.get() to show the result in the console window, but it does not work. It reveals a window flash.

Answer 1

You peek to see if there is a newline in the input. If it is you leave it in the input buffer and break out of the loop, where your cin.get() call will read that newline.

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If you only want to read a single line, then I suggest you use std::getline to read the line, put it into an std::istringstream and read the numbers from that stream.

Also note that when reading numbers using >> , leading white-space is read and discarded so you don't have to check for that.