Coding challenges are a great resource for learning coding techniques and improve analytical thinking, this is a collection of challenges from different platforms.
Objective
Today, we’re taking what we learned yesterday about Inheritance and extending it to Abstract Classes. Because this is a very specific Object-Oriented concept, submissions are limited to the few languages that use this construct. Check out the Tutorial tab for learning materials and an instructional video!
Task
Given a Book class and a Solution class, write a MyBook class that does the following:
Inherits from Book
Has a parameterized constructor taking these
3
parameters:- string
title
- string
author
- int
price
- string
Implements the Book class' abstract display() method so it prints these lines:
Title:
, a space, and then the current instance’stitle
.Author:
, a space, and then the current instance’sauthor
.Price:
, a space, and then the current instance’sprice
.
Note: Because these classes are being written in the same file, you must
not use an access modifier (e.g.: public
) when declaring MyBook or your
code will not execute.
Input Format
You are not responsible for reading any input from stdin. The Solution class creates a Book object and calls the MyBook class constructor (passing it the necessary arguments). It then calls the display method on the Book object.
Output Format
The void display()
method should print and label the respective title
,
author
, and price
of the MyBook object’s instance (with each value on its
own line) like so:
Title: $title
Author: $author
Price: $price
Note: The $
is prepended to variable names to indicate they are
placeholders for variables.
Sample 00
input00.txt
The Alchemist
Paulo Coelho
248
output00.txt
Title: The Alchemist
Author: Paulo Coelho
Price: 248
Solution
main.go
package main
import (
"bufio"
"fmt"
"os"
"strconv"
)
func main() {
s := bufio.NewScanner(os.Stdin)
s.Scan()
title := s.Text()
s.Scan()
author := s.Text()
s.Scan()
price, _ := strconv.Atoi(s.Text())
book := NewMyBook(title, author, price)
book.display()
}
type Book struct {
title, author string
}
func (b Book) display() {
fmt.Println("Implement the 'display' method!")
}
type MyBook struct {
Book
price int
}
func NewMyBook(title, author string, price int) MyBook {
return MyBook{Book{title, author}, price}
}
func (b *MyBook) display() {
fmt.Printf("Title: %v\nAuthor: %v\nPrice: %v\n", b.title, b.author, b.price)
}
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