import java.util.*;

// Please note that this program is annotated with comments for us
// and are not an example of how to write comments. Proper method
// comments should describe parameters, returns, and what the 
// method does, rather than notes to other developers

public class DatingAge {
   public static void main(String[] args) {
      /*
      // Wrong way to do everything!!!!!
         int minDatingAge;
         minDatingAge(42);
      */
      
      Scanner console = new Scanner(System.in);
      System.out.print("Enter your age: ");
      int age = console.nextInt();
      
      int minDatingAge = minDatingAge(age);
      System.out.println("Min dating age for " + age + ": " + minDatingAge(age));
      
      int maxDatingAge = maxDatingAge(age);
      System.out.println("Max dating age for " + age + ": " + maxDatingAge);
      System.out.println();
      
      System.out.print("Enter your honey's age: ");
      int otherAge = console.nextInt();
      
      // if other person is less than minDatingAge -- ruh roh!
      // otherwise -- it's possible!
      
      // relational operators: >, <, >=, <=, ==, !=
      // <expression> operator <expression>
      // join two+ tests:
      //    test1 && test2  -- and
      //    test1 || test2  -- or
      
      if (otherAge < minDatingAge || otherAge > maxDatingAge) {
         System.out.println("ruh roh!");
      } else {
         System.out.println("it's possible!");
      }
      
      /*
         Could also produce the same behaviour by switching
         the if / else above.
      
      if (otherAge >= minDatingAge && otherAge <= maxDatingAge) {
         System.out.println("it's possible!");
      } else {
         System.out.println("ruh roh!");
      }
      */

   }
   
   // min dating age: age / 2 + 7;
   // Returns:
   //    1. what type of data you're returning
   //    2. return the data
   public static int minDatingAge(int age) {
      int minDatingAge = age / 2 + 7;
      return minDatingAge;
   }
   
   // max dating age: (age - 7) * 2
   public static int maxDatingAge(int age) {
      int maxDatingAge = (age - 7) * 2;
      return maxDatingAge;
   }
}