Input and Output Functions

Input

In C++ we can read from the input stream in two different ways: Formatted with the extractor >> and unformatted with explicit methods.

Formatted input

The extraction operator >>:

• is predefined for all built-in types and strings.
• can be implemented for user-defined data types.
• can be configured by format specifiers.

🔑 std::cin ignores, by default, leading whitespace

#include <iostream>
//...
int a, b;
std::cout << "Two natural numbers:

...