Task:

Write a Person class with an instance variable, age, and a constructor that takes an integer, initialAge, as a parameter.

The constructor must assign initialAge to age after confirming the argument passed as initialAge is not negative;

if a negative argument is passed as initialAge, the constructor should set age to 0 and print Age is not valid, setting age to 0..

In addition, you must write the following instance methods:

• yearPasses() should increase the age instance variable by 1.
• amIOld() should perform the following conditional actions: 

If age <= 13, print You are young..

If age >= 13 and age < 18, print You are a teenager..

Otherwise, print You are old..

Input Format:

Input is handled for you by the stub code in the editor. The first line contains an integer, T (the number of test cases), and the T

subsequent lines each contain an integer denoting the age of a Person instance.

Constraints:

1 < T < 4

-5 < age < 30
 
Output Format:

Complete the method definitions provided in the editor so they meet the specifications outlined above;

the code to test your work is already in the editor.

If your methods are implemented correctly, each test case will print 2 or 3 lines (depending on whether or not a valid

initialAge was passed to the constructor).
 

Sample Input:

4

-1

10

16

18

Sample Output:

Age is not valid, setting age to 0.

You are young.

You are young.

You are young

You are a teenager.

You are a teenager.

You are old.

You are old.

You are old.

Explanation:

Test Case 0: initialAge = -1

Because initialAge < 0, our code must set age to 0 and print the "Age is not valid..." message followed by the young message. Three years pass and

age = 3, so we print the young message again.

Test Case 1:initialAge = 10

Because initialAge < 13, our code should print that the person is young. Three years pass and age = 13,

so we print that the person is now a teenager.

Test Case 2:initialAge = 16

Because 13 < initialAge < 18, our code should print that the person is a teenager. Three years pass and age = 19,

so we print that the person is old.

Test Case 3:initialAge = 18

Because initialAge >= 18 , our code should print that the person is old. Three years pass and the person is still old at age = 21,

so we print the old message again.

PHP Solutions:

class Person{
   public $age;
   public function __construct($initialAge){
          // Add some more code to run some checks on initialAge
          if($initialAge < 0){
              $this->age = 0;
              print "Age is not valid, setting age to 0.\n";
          }else{
              $this->age = $initialAge;
          }

    }
   public  function amIOld(){
            // Do some computations in here and print out the correct statement to the console 
            if($this->age < 13){
                print "You are young.\n";
            }
            else if($this->age >= 13 && $this->age < 18){
                print "You are a teenager.\n";
            }else{
                print "You are old.\n";
            }

    }
   public  function yearPasses(){
          // Increment the age of the person in here
          $this->age += 1;
    }
  
}

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