How to Read Multiple Numbers from a Single Line of Input in C++?

In C++, when working with user inputs we often need to take input of multiple numbers from a user in a single line. In this article, we will learn how to read multiple numbers from a single line of input in C++.

Example

Input:
1 7 0 4 6 8

Output:
Entered Number: 1, 7, 0, 4, 6, 8

Take Multiple Numbers as Input in One Line in C++

To read multiple numbers from a user in one line, we can use the std::cin object as it by default takes the input separated by a whitespace as a separate input. So, if the numbers are separated by a whitespace, we can take them as input in multiple number variables.

C++ Program to Read Multiple Numbers from Single Line of Input

The below example demonstrates the use of cin to read the whole line and take the input as separate variables.

// C++ program to read multiple numbers in a single line of
// input
#include <iostream>
#include <vector>
using namespace std;
int main()
{
    vector<int> numbers;
    int num;
    // Prompt the user to enter numbers separated by spaces
    cout << "Enter numbers separated by spaces: ";
    // Input numbers until the user enters something other
    // than an integer
    while (cin >> num) {
        // Add the entered number to the vector
        numbers.push_back(num);
    }
    // Output the entered numbers
    cout << "You entered: ";
    for (int i : numbers) {
        cout << i << " ";
    }
    cout << endl;
    return 0;
}

Output

Enter multiple numbers separated by spaces: 1 2 3 4 5
Processed numbers: 1 2 3 4 5

Time Complexity: O(n)
Space Complexity: O(n)