Day 4: Class vs. Instance

process.stdin.resume();
process.stdin.setEncoding('ascii');
var input_stdin = "";
var input_stdin_array = "";
var input_currentline = 0;

process.stdin.on('data', function (data) {
 input_stdin += data;
});

process.stdin.on('end', function () {
input_stdin_array = input_stdin.split("\n");
main();    
});

  function readLine() {
  return input_stdin_array[input_currentline++];
 }

function Person(initialAge){
// Add some more code to run some checks on initialAge
var age = initialAge;
this.amIOld=function(){
// Do some computations in here and print out the correct 
  statement to the console
  if(age < 13 && age > -1 )
    console.log("You are young.");

    else if(age < 18 && age > 12) 
        console.log("You are a teenager.");

    else if (age >17)
        console.log("You are old.");

    else {
        console.log("Age is not valid, setting age to 0.");
        age = 0;
        this.amIOld();
    }    
  };
  this.yearPasses=function(){
      // Increment the age of the person in here
      age++;
  };
  }

 function main() {

 var T=parseInt(readLine());
 for(i=0;i<T;i++){
 var age=parseInt(readLine());
 var p=new Person(age);
  p.amIOld();
   for(j=0;j<3;j++){
    p.yearPasses();

 }
 p.amIOld();
 console.log("");   
 }
 }