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  1. Prepare
  2. Tutorials
  3. 30 Days of Code
  4. Day 4: Class vs. Instance
  5. Discussions

Day 4: Class vs. Instance

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1898 Discussions

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  • rocio_alpizarqu1
     + 0 comments

    public class Solution { int age;

    public Solution(int initialAge){
    if(initialAge >0){
        age =initialAge;
        }else{
             System.out.println("Age is not valid, setting age to 0.");
             this.age=0;
        }

    }

public void amIOld(){
    if (age<13){
        System.out.println("You are young.");
    }else if (age >=13 && age <18){
        System.out.println("You are a teenager.");
        }else if(age>=18){
            System.out.println("You are old.");
        }          
}    
public void yearPasses(){
    this.age = ++age;
}

public static void main(String[] args) {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    Scanner scan = new Scanner(System.in);
    int T = scan.nextInt();

    for (int i = 0; i<T;i++){
        int age = scan.nextInt();
        Solution p = new Solution (age);
        p.amIOld();
        for(int j=0;j<3;j++){
            p.yearPasses();
        }
        p.amIOld();
        System.out.println();

    }
    scan.close();

    } }

  • Arunkumar2001
     + 1 comment
    using System;
using System.Collections.Generic;
using System.IO;

class Person {
    public int age;     
	 public Person(int initialAge)
     {
        age = initialAge < 0 ? 0 : initialAge;
        if(initialAge <0)
            Console.WriteLine("Age is not valid, setting age to 0.");
     }
     public void amIOld() {
        // Do some computations in here and print out the correct statement to the console 
        if(age < 13)
            Console.WriteLine("You are young.");
        else if(age >= 13 && age <18)
            Console.WriteLine("You are a teenager.");
        else
            Console.WriteLine("You are old.");
            
     }

     public void yearPasses() {
        // Increment the age of the person in here
        age ++;
     }

static void Main(String[] args) {
        int T=int.Parse(Console.In.ReadLine());
        for (int i = 0; i < T; i++) {
            int age=int.Parse(Console.In.ReadLine());
            Person p=new Person(age);
             p.amIOld();
                for (int j = 0; j < 3; j++) {
                  p.yearPasses();
                }
                p.amIOld();
                Console.WriteLine();
        }
    }
}

  • vinicius_robles
     + 0 comments

    JavaScript solution:

    function Person(initialAge){
    if (initialAge < 0) {
        console.log("Age is not valid, setting age to 0.");
        this.age = 0;
    } else {
        this.age = initialAge;
    }
    
  this.amIOld=function(){
   if (this.age < 13) {
    console.log("You are young.");
   } else if (this.age >= 13 && this.age < 18) {
    console.log("You are a teenager."); 
   } else {
    console.log("You are old.");
   };
   
  };
   this.yearPasses=function(){
          this.age += 1;
   };
}

  • m_ardaaycan
     + 0 comments

    4th exercise isnt available in C and idk any other language help

  • srayrock
     + 1 comment

    Python3 solution: On the same point as per my earlier message, I referred to the solution present in the Editorial section as well and tried it. It is still failing with the initial test case where initalAge is -1. Can anyone please advise on what is wrong in the code?

    class Person: def init(self,initialAge): if (initialAge < 0): print("Age is not valid, setting age to 0") self.age = 0 else: self.age = initialAge

    def amIOld(self):
    if self.age >= 18:
        print("You are old.")
    elif self.age >= 13:
        print("You are a teenager.")
    else:
        print("You are young.")

def yearPasses(self):
    self.age += 1