#include <iostream>
#include <string>

using namespace std;


int main() {
   int quantity=0;
   bool error=false;

   do {
       error=false;
       // Read in a value.
       cout << "Enter in a quantity (1-5): ";
       cin >> quantity;

       // cin failed, remove the invalid values, and
       // clear the error flag.
       if(cin.fail()){
           error=true;
           cin.clear();
           cin.ignore(numeric_limits<streamsize>::max(),'\n');
           cout << "Invalid value!" << endl;
       }

       // Check range.
       else if(quantity<1 || quantity>5) {
           error=true;
           cout << "Please pick a quantity between 1 and 5." << endl;
       }

   }while (error);

   cout << "Quantity: " << quantity << endl;

}