How does the cin.peek function work?

Question

C++ / C#

while (!(cin >> b) || (cin.peek() != '\n') || (b <= 0))
                    {
                        cin.clear();
                        while (cin.get() != '\n');
                        cout << "Error enter!\n";
                        cout << "to begin again, press any key...\n";
                    }

Here is the code where it is applied. Also interested in the cin.clear() function.
PS. human language pls)

Answer 1

Which robot do you propose to explain?
And in the case - do you have a refman banned chtoli?
Looks at the next character without moving the cursor so-and-so.

Answer 2

Have you tried searching on the site msdn.microsoft.com ?

Answer 3

Could you describe this algorithm (code) point by point, what happens behind what.

while (!(cin >> b) || (cin.peek() != '\n') || (b <= 0))
                    {
                        cin.clear();
                        while (cin.get() != '\n');
                        cout << "Error enter!\n";
                        cout << "to begin again, press any key...\n";
                    }