Modern C++ for Absolute Beginners: A Friendly Introduction to C++ Programming Language and C++11 to C++20 Standards

© Slobodan Dmitrović 2020

S. DmitrovićModern C++ for Absolute Beginnershttps://doi.org/10.1007/978-1-4842-6047-0_8

8. Standard Input

Slobodan Dmitrović¹ 

(1)

Belgrade, Serbia

 

C++ provides facilities for accepting input from a user. We can think of the standard input as our keyboard. A simple example accepting one integer number and printing it out is:

#include <iostream>

int main()

{

    std::cout << "Please enter a number and press enter: ";

    int x = 0;

    std::cin >> x;

    std::cout << "You entered: " << x;

}

The std::cin is the standard input stream, and it uses the >> operator to extract what has been read into our variable. The std::cin >> x; statement means: read from a standard input into a x variable. The cin object resides inside the std namespace. ...