EM-Tirupati Codeathon Series #05

[Question] #1

Swap the variables (Java code)

Write a Java Program that Swap the Values of 02 Variables without Using a 03rd Variable. The Swapped Value Should be In Such a Way that the 1st Variable will hold only 10% (rounded down) of the 2nd value and the 02nd Variable will hold only the 20% (rounded down) of the 1st value.

[Sample Input]

var1=250, var2=400

[Sample Output]

var1=40, var2=50

Code Explaination:

1. It demonstrates basic arithmetic operations in Java to swap and manipulate integer values.
2. The program uses a Scanner to collect user input for var1 and var2.
3. It swaps the values of var1 and var2 without a temporary variable using arithmetic operations
4. After swapping, both var1 and var2 are scaled down by multiplying them by 0.1 and 0.2, respectively.
5. The program displays the swapped and scaled values as "Swapped values: var1 = [var1], var2 = [var2]."

GitHub Repo link:  http://surl.li/mpkjd

Source Code(Java):

import java.util.Scanner;

public class Question05_01_Venkata {
    public static void main(String[] args) {
        // Step 1: Input
        Scanner input = new Scanner(System.in);
        System.out.print("Enter the value of var1: ");
        int var1 = input.nextInt();
        System.out.print("Enter the value of var2: ");
        int var2 = input.nextInt();

        // Step 2: Swap using arithmetic operations
        // Swap var1 and var2 without using a temporary variable
        var1 = var1 + var2;
        var2 = var1 - var2;
        var1 = var1 - var2;

        // Step 3: Apply a scaling factor
        // Scale down the swapped values
        var1 = (int) (0.1 * var1);
        var2 = (int) (0.2 * var2);

        // Step 4: Output
        System.out.println("Swapped values: var1 = " + var1 + ", var2 = " + var2);
    }
}

 

[Question] #2

Java Inheritance / Simple oops [www.techgig.com]

Create Two Classes

BaseClass

The Rectangle class should have two data fields-width and height of Int types. The class should have display() method, to print the width and height of the rectangle separated by space.

DerivedClass

The RectangleArea class is Derived from Rectangle class, I.e., It is the Sub-Class of Rectangle class. The class should have read_Input() method, to Read the Values of width and height of the Rectangle. The RectangleArea dass should also Overload the display() Method to Print the Area (width”height) of the Rectangle.

[Sample Input]

The First and Only Line of Input contains two space separated Integers denoting the width and height of the Rectangle.

Constraints

1 <= width, height <= 10³

[Sample Output]

The Output Should Consist of Exactly Two Lines.

In the First e, Print the Width and Height of the Rectangle Separated by Space.

In Second line, Print the Area of the Rectangle

1. Code Explaination:

1. Class Structure:
• Two classes: Rectangle for storing dimensions and RectangleArea for calculation.
• Inheritance: RectangleArea extends Rectangle for added functionality.
2. User Input:
• The program collects user input for rectangle width and height.
• Input uses the Scanner class, and clear prompts are provided.
3. Display Method Override:
• RectangleArea class overrides display method to show dimensions and area.
4. Area Calculation:
• The program calculates the rectangle area by multiplying width and height.
5. Main Method:
• The entry point creates an instance of RectangleArea.
• Displays a user-friendly interface with a title and prompts.
• Collects user input and displays rectangle dimensions and area.
6. User-Friendly:
• The code offers a clear and user-friendly interface.
7. Purpose:
• Allows users to calculate the area of a rectangle from its dimensions. It follows best coding practices for clarity and usability.

 GitHub Repo link: http://surl.li/lyipp

Source Code(Java):

import java.util.Scanner;

class Rectangle {
    int width;
    int height;

    public void display() {
        System.out.println("Rectangle dimensions: " + width + " x " + height);
    }
}

class RectangleArea extends Rectangle {
    public void readInput() {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter the width of the rectangle: "+"\n");
        width = scanner.nextInt();

        System.out.print("Enter the height of the rectangle: "+"\n");
        height = scanner.nextInt();

        scanner.close();
    }

    @Override
    public void display() {
        super.display(); // Display dimensions from the parent class

        int area = width * height;
        System.out.println("Area of the rectangle: " + area);
    }
}

public class Codeathon05_02_Venkata {
    public static void main(String[] args) {
        RectangleArea rectangleArea = new RectangleArea();
        System.out.println("Rectangle Area Calculator");
        System.out.println("--------------------------"+"\n");

        rectangleArea.readInput(); // Prompt user to enter width and height
        rectangleArea.display();   // Display rectangle dimensions and area
    }
}

 

Thank you

Venkata kishore T(Intern)

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Data Shield Team,

Enterprise Minds.