#include <iostream>

using namespace std;

/* WHILE loop

while(condition)
command to be executed while the condition is satisfied

*/

int main()
{
int age;
cout << "Please enter your age: ";
cin >> age;

while(cin.fail())      // it returns true if the input buffer has been given wrong data
{
cout << "You've entered the wrong data. Please enter your age again: ";
cin.clear();                    // hides the error flag
cin.ignore(99999, '\n');        // empties the buffer
cin >> age;
}

cout << "You are " << age << " years old. ";
if(age > 17)
cout << "You are an adult.\n";
else
cout << "You are not an adult.\n";

return 0;
}