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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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1915 Discussions

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  • yashdeora98294
     + 0 comments

    Here is problem solution in Python, Java, C++, C and javascript - https://programmingoneonone.com/hackerrank-day-4-class-vs-instance-30-days-of-code-solution.html

  • samten507
     + 0 comments

    what is wrong with my code please assist

    this.age=initialAge; if(initialAge<0){ this.age=0; System.out.println("Age is not valid, settin age to 0."); }

    }

public void amIOld() {
    // Write code determining if this person's age is old and print the correct statement:
    if(age<13)System.out.println("You are young.");
    else if(age>=13&&age<18)System.out.println("You are a teenager.");

    else System.out.println("You are old.");
}

public void yearPasses() {
    // Increment this person's age.
    this.age+=1;
}

  • demianmyers
     + 0 comments

    TypeScript solution. Note, I added an ageBy helper method to the Person class for to DRY up duplicate aging code :

    function main() {
    // Enter your code here
    
    const testAmount = Number(readLine())
    
    const lastTestIndex = 4
    
    Array.from({length: testAmount}).forEach((_, index) => {
        const p1 = new Person(Number(readLine()))
        p1.amIOld()
        p1.ageByYears(3)
        p1.amIOld()
        
        if (index !== lastTestIndex) process.stdout.write('\n')
    })
}

class Person {
    age = 0
    
    constructor(initalAge: number) {
        if (initalAge < 0) {
            process.stdout.write('Age is not valid, setting age to 0.\n')
            return
        }
        
        this.age = initalAge
    }
    
    yearPasses(): void {
        this.age++
    } 
    
    amIOld(): void {
        if (this.age < 13) {
            process.stdout.write('You are young.\n')
        } else if (this.age >= 13 && this.age < 18) {
            process.stdout.write('You are a teenager.\n')
        } else {
            process.stdout.write('You are old.\n')
        }
    }
    
    ageByYears(years: number) {
        Array.from({length: years}).forEach(_ => this.yearPasses())
    }
}

  • vinaya_daware
     + 0 comments

    How am i supposed to debug if i am not allowed to change/ update the main[] method at all? This program seems to have problem in itself i.e. the testcase is failing because of extra blank space but i am unable to remove that additional print statement from the main[] method.

  • pedroaugusto466
     + 0 comments

    C# code of the Person class..

    public int age;     
    
    public Person(int initialAge) {
        if (initialAge > 0) {
            age = initialAge;
        } else {
            age = 0;
            Console.WriteLine("Age is not valid, setting age to 0.");
        }
    }
    
    public void amIOld() {
        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() {
        age++;
    }