Addition and Subtraction Using Polymorphism in Java

 


Program Listing

import java.util.Scanner;


class MathOperation {

    public int performOperation(int a, int b) {

        return 0; // Base class default implementation

    }

}


class Addition extends MathOperation {

    @Override

    public int performOperation(int a, int b) {

        return a + b;

    }

}


class Subtraction extends MathOperation {

    @Override

    public int performOperation(int a, int b) {

        return a - b;

    }

}


public class Main {

    public static void main(String[] args) {

        MathOperation operation = null;

        int num1, num2;

        char op;


        Scanner scanner = new Scanner(System.in);


        System.out.println("\n\n\tAddition and Subtraction Using Polymorphism in Java\n");

        System.out.print("\tEnter two numbers: ");

        num1 = scanner.nextInt();

        num2 = scanner.nextInt();

        System.out.print("\tEnter the operation (+ for addition, - for subtraction): ");

        op = scanner.next().charAt(0);


        if (op == '+') {

            operation = new Addition();

        } else if (op == '-') {

            operation = new Subtraction();

        } else {

            System.out.println("\tInvalid operation.");

            return;

        }


        int result = operation.performOperation(num1, num2);

        System.out.println("\n\tThe Result: " + result);


        scanner.close();


        System.out.println("\n\tEnd of Program. Thank you for using this program.");

    }

}


Simple Calculator Using Abstraction in C++

 


Program Listing

#include <iostream>


// Abstract class for calculator operations

class Operation {

public:

    virtual double calculate(double a, double b) = 0;

};


// Concrete subclasses for each operation

class Addition : public Operation {

public:

    double calculate(double a, double b) override {

        return a + b;

    }

};


class Subtraction : public Operation {

public:

    double calculate(double a, double b) override {

        return a - b;

    }

};


class Multiplication : public Operation {

public:

    double calculate(double a, double b) override {

        return a * b;

    }

};


class Division : public Operation {

public:

    double calculate(double a, double b) override {

        if (b == 0) {

            std::cerr << "Error: Division by zero is not allowed." << std::endl;

            return 0; // Return 0 as an error value

        }

        return a / b;

    }

};


int main() {

    double num1, num2;

    char operation;


    std::cout <<"\n\n\tSimple Calculator Using Abstraction in C++\n";

    std::cout << "\n\tGive two numbers: ";

    std::cin >> num1 >> num2;


    std::cout << "\tEnter the operation (+, -, *, /): ";

    std::cin >> operation;


    Operation* op = nullptr;


    switch (operation) {

        case '+':

            op = new Addition();

            break;

        case '-':

            op = new Subtraction();

            break;

        case '*':

            op = new Multiplication();

            break;

        case '/':

            op = new Division();

            break;

        default:

            std::cerr << "\tError: Invalid operation." << std::endl;

            return 1;

    }


    double result = op->calculate(num1, num2);


    std::cout << "\n\tThe Result: " << result << std::endl;

     std::cout << "\n\n\tEnd of Program. Thank you for using this program." << std::endl;

    delete op;


    return 0;

}


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Difference of Two Numbers in C

 



Program Listing

#include <stdio.h>


int main()

{   

    int a=0,b=0,difference=0;

    printf("\n\n");

printf("\tDifference of Two Numbers in C");

printf("\n\n");

printf("\tGive Two Numbers : ");

    scanf("%d%d",&a,&b);


    /* Compute the Difference of Two Numbers */

    

    difference = (a - b);

    

printf("\n\n");

printf("\t===== DISPLAY RESULTS =====");

printf("\n\n");

printf("\tThe difference between %d and %d is %d.",a,b,difference);

printf("\n\n");

printf("\tEnd of Program");

printf("\n");

}


Student Record System in C++


 


Program Listing

#include <iostream>

#include <string>


class Student {

public:

    // Constructor to initialize the student's information

    Student(std::string name, int rollNumber, double marks) {

        this->name = name;

        this->rollNumber = rollNumber;

        this->marks = marks;

    }


    // Function to display the student's information

    void displayInfo() {

        std::cout << "\n\tStudent Name: " << name << std::endl;

        std::cout << "\tRoll Number: " << rollNumber << std::endl;

        std::cout << "\tMarks: " << marks << std::endl;

    }


private:

    std::string name;

    int rollNumber;

    double marks;

};


int main() {

    std::string name;

    int rollNumber;

    double marks;


    // Input student information

    std::cout <<"\n";

    std::cout << "\tEnter student's name: ";

    std::cin >> name;


    std::cout << "\tEnter roll number: ";

    std::cin >> rollNumber;


    std::cout << "\tEnter marks: ";

    std::cin >> marks;


    // Create a Student object with the provided information

    Student student(name, rollNumber, marks);


    char choice;

    

    do {

        std::cout << "\n\tStudent Record Main Menu\n" << std::endl;

        std::cout << "\t[1] Display student information" << std::endl;

        std::cout << "\t[2] Quit Program" << std::endl;

        std::cout << "\tEnter your choice: ";

        std::cin >> choice;


        if (choice == '1') {

            // Display the student's information

            student.displayInfo();

        } else if (choice != '2') {

            std::cout << "\n\tInvalid choice. Please try again." << std::endl;

        }


    } while (choice != '2');

     std::cout << "\n\tEnd of Program. Thank you for using this program." << std::endl;

    return 0;

}


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Monday, July 8, 2024

I was assigned as Program Chair in Computer Studies in University of Negros Occidental Recoletos Graduate School

 I am very happy to announce my appointment as Program Chair in the Computer Studies in the University of Negros Occidental - Recoletos Graduate School stating this July 8, 2024.  Thank you LORD for this opportunity and also to my dean Dr. Dennis Madrigal for the support and trust you have given me.